An extremely neglected aspect of hair growth/slowing down hair loss is monitoring inflammation.
Here's what you need to know.
Thread🧵
It's George.
Monitoring inflammation is usually neglected because hair loss is traditionally treated only as a hormonal or genetic issue.
Follicle inflammation happens deep under the skin and often develops silently without visible surface signs.
But this chronic condition directly attacks hair stem cells, permanently stopping the creation of new strands.
It also causes micro-scarring around the root, choking out the vital nutrients the follicle needs.
Furthermore, the body diverts its cellular energy toward fighting inflammation instead of fueling new hair growth.
Ultimately, internal inflammation acts as an accelerator, triggering hereditary pattern baldness much earlier in life.
While inflammation is essential for survival and one of the most fundamental processes in the human body, it can also become harmful when excessive, prolonged or misdirected, leading to tissue damage, fibrosis, chronic disease and so on.
That’s why if you have a chronic health issue that you are trying to resolve, it’s very unlikely that you haven’t stumbled across terms such as “anti-inflammatories”, “inflammation cascade” and so on.
But what is inflammation exactly?
At its core, as you will find in most of its definitions, inflammation is the body’s protective response to injury or infection in vascularized living tissue.
So it occurs only in tissues with blood vessels and involves both vascular and cellular components.
It is broadly divided into acute and chronic forms.
Acute inflammation is dominated by neutrophils, begins within minutes to hours and lasts hours to days.
Examples include bacterial pneumonia, appendicitis or a simple cutaneous infection.
Chronic inflammation, in contrast, develops slowly and persists for weeks, months or years.
Rheumatoid arthritis, Crohn’s disease and atherosclerosis are some of the classic examples.
What can trigger inflammation?
Virtually any insult capable of causing tissue damage can initiate inflammation, whether that’s high blood sugar, working out, sunlight exposure, mold, cortisol, a virus or a burn.
Now in order to understand the acute inflammatory response, we must understand that it unfolds through three interconnected components:
-Vascular changes
-Cellular recruitment
-Mediator release
Vascular changes begin with transient vasoconstriction lasting seconds, followed by sustained vasodilation mediated by histamine and prostaglandins.
This increases blood flow, producing redness and warmth.
Simultaneously, vascular permeability rises through several mechanisms that are triggered by histamine and leukotrienes, for example.
The resulting leakage of protein-rich fluid forms an exudate(*), contributing to swelling.
Cellular recruitment follows a highly ordered sequence known as leukocyte extravasation.
First, leukocytes marginate to the vessel periphery and roll along the endothelium via reversible interactions between selectins and their ligands.
Chemokines then activate leukocyte integrins, which bind firmly to endothelial adhesion molecules such as ICAM-1 and VCAM-1.
The leukocyte then transmigrates between endothelial cells using PECAM-1, migrates toward the injury site along a chemokine gradient, and finally phagocytoses the target after opsonization by IgG or complement fragment C3b.
Finally, chemical mediators derive from plasma or cells.
Plasma systems include the complement cascade, generating anaphylatoxins C3a and C5a, the kinin system, producing bradykinin and the coagulation cascade.
Cell-derived mediators include histamine from mast cells and basophils, causing early vasodilation, arachidonic acid metabolites such as prostaglandins and leukotrienes and cytokines from macrophages and other cells.
(*)The fluid that leaks into tissues during inflammation is called an exudate.
Its composition varies with the insult.
Serous exudates are watery with low protein content, as seen in blisters or early pleural effusions.
Fibrinous exudates are rich in fibrinogen that polymerizes into fibrin.
Purulent or suppurative exudates contain neutrophils, necrotic debris, and microorganisms, forming pus in abscesses or bacterial pneumonias.
Hemorrhagic exudates contain red blood cells and occur in viral infections or malignancies.
Pseudomembranous exudates combine fibrin and necrotic epithelium, as in Clostridium difficile colitis.
Now, when tissue damage is minimal and the stimulus is efficiently cleared, complete resolution occurs with restoration of normal architecture, as in resolving lobar pneumonia.
But if damage is substantial, healing proceeds by fibrosis and scar formation.
Suppurative inflammation may wall off into an abscess. If the inciting agent persists or the response is dysregulated, acute inflammation transitions to a chronic phase.
Now chronic inflammation is characterized by persistent mononuclear cell infiltration, ongoing tissue destruction, and attempted repair through angiogenesis and fibrosis.
Granulomatous inflammation represents a specialized chronic response in which macrophages transform into epithelioid cells and fuse into multinucleated giants. Here, inflammation extends beyond local tissues. Fever results from macrophage-derived IL-1 and TNF-alpha inducing prostaglandin E2 in the hypothalamus.
The liver mounts an acute-phase response under IL-6 signaling, increasing C-reactive protein, fibrinogen, and serum amyloid A while decreasing albumin. Leukocytosis occurs with neutrophilia in bacterial infections and lymphocytosis in viral ones.
Prolonged TNF-alpha elevation causes cachexia through appetite suppression and muscle wasting.
If these were too complicated, think that inflammation is the immune system in action.
It is not a byproduct, a side effect or a separate process but the integrated, coordinated response of innate and adaptive immune cells, soluble mediators and non-immune tissues (endothelium, fibroblasts, adipocytes) that attempt to restore homeostasis.
That's why when adaptive immunity goes rogue (think Th17 in psoriasis, Th1 in TB granuloma) there's always chronic inflammation.
Now let’s move on to the mediators of inflammation (these molecules are not just relevant to inflammation).
These are: cytokines, chemokines, lipids, ROS / RNS, proteases and histamine.
So let’s break each one down now.
First we have pro-inflammatory cytokines.
These are small secreted proteins that amplify and coordinate inflammation.
The main ones are TNF-alpha, IL-1, IL-6, and IL-8.
TNF-alpha, is mainly secreted by (activated) macrophages and Th1 cells in response to bacterial lipopolysaccharide, exists as a transmembrane precursor cleaved by the enzyme TACE into a soluble trimer.
It plays key roles in the pathogenesis of autoimmune diseases such as rheumatoid arthritis (RA), IBD and psoriatic arthritis (PsA).
In RA for example it activates synovial fibroblasts, which causes the overproduction of cathepsins and MMP.
The breakdown of collagen and proteoglycan follows, resulting in cartilage and bone destruction, as well as joint erosion.
IL-1 exists in two forms: IL-1alpha and IL-1beta.
IL-1beta synthesis requires two signals: transcriptional upregulation via NF-kappaB, followed by inflammasome-mediated cleavage by caspase-1.
The inflammasome assembles in response to danger signals such as ATP, uric acid crystals, or bacterial toxins.
IL-6, secreted by macrophages, T cells, and fibroblasts, binds a membrane or soluble receptor and signals through gp130 and JAK-STAT3.
It is the primary driver of the hepatic acute-phase response, stimulates B-cell differentiation, and promotes Th17 cell development.
IL-8 produced by macrophages and endothelial cells, binds CXCR1 and CXCR2 receptors to attract and activate neutrophils (it dominates in bacterial infections, psoriasis and acute respiratory distress syndrome).
Other important cytokines include IL-12 and IL-23, which drive Th1 and Th17 responses, respectively and IL-17, which recruits neutrophils and induces defensins in psoriasis and spondyloarthritis.
Then we have chemokines.
Chemokines are a subset of cytokines that function as chemotactic gradients to direct leukocyte migration during inflammation and are classified into four families (based on cysteine spacing): CXC, CC, C and CX3C.
The prototype neutrophil chemoattractant is IL-8, also known as CXCL8, produced by macrophages, endothelial cells, and neutrophils themselves in response to IL-1 or TNF-alpha.
It binds CXCR1 and CXCR2 receptors to trigger neutrophil degranulation, respiratory burst and firm adhesion via integrin activation.
MCP-1, or CCL2, recruits monocytes and memory T cells by binding CCR2 and is central to atherosclerotic plaque formation and chronic inflammation in obesity.
RANTES or CCL5, attracts eosinophils, basophils, and T cells via CCR1, CCR3, and CCR5 and plays a major role in allergic inflammation and viral infections.
Eotaxin, or CCL11, specifically draws eosinophils in asthma and parasitic infections.
Fractalkine, or CX3CL1, exists in membrane-bound and soluble forms; the membrane form promotes firm adhesion, while the soluble form acts as a chemoattractant for monocytes and NK cells.
Chemokine production is tightly regulated by NF-kappaB and occurs within hours of tissue injury, creating gradients that guide the ordered arrival of neutrophils first, followed by monocytes.
Moving on to lipid mediators.
Lipid mediators are rapidly generated from membrane phospholipids and act locally to modulate vascular tone, permeability, and leukocyte function.
All lipid mediators are derived from arachidonic acid (AA), released by phospholipase A2 (PLA₂) from cell membranes, have half-lives of seconds to minutes and are degraded by specific enzymes such as 15-hydroxyprostaglandin dehydrogenase.
The pathway begins with phospholipase A2 liberating arachidonic acid, which feeds into cyclooxygenase or lipoxygenase branches.
Prostaglandin E2, produced via inducible COX-2 and mPGES-1 in macrophages and fibroblasts, is the dominant lipid in acute inflammation.
It synergizes with histamine and bradykinin to cause vasodilation and pain sensitization through EP2 and EP4 receptors, induces fever via hypothalamic EP3 receptors and at later stages promotes resolution by switching macrophages to an M2 phenotype.
Prostacyclin, or PGI2, from endothelial cells potently vasodilates and inhibits platelet aggregation.
Leukotriene B4, generated via 5-lipoxygenase in neutrophils and macrophages, is a powerful neutrophil chemoattractant and activator that rivals IL-8 in potency.
Cysteinyl leukotrienes LTC4, LTD4, and LTE4, produced by mast cells and eosinophils, cause bronchoconstriction, mucus secretion and vascular leakage in asthma.
When it comes to ROS / RNS, reactive oxygen species and reactive nitrogen species are generated by immune cells as microbicidal weapons but also amplify inflammation through tissue signaling.
Neutrophils and macrophages assemble the NADPH oxidase complex upon phagocytosis or Fc receptor engagement, producing superoxide that dismutates to hydrogen peroxide and then hypochlorous acid via myeloperoxidase.
These oxidants damage microbial membranes and DNA but also oxidize host lipids and proteins, creating danger signals that activate the NLRP3 inflammasome.
Peroxynitrite, formed by superoxide reacting with nitric oxide from inducible nitric oxide synthase in macrophages, nitrates tyrosine residues and disrupts endothelial barrier function.
ROS activate redox-sensitive transcription factors NF-kappaB and AP-1, upregulating cytokine and adhesion molecule expression, and induce mitochondrial damage that releases mtDNA to further stimulate inflammation.
In resolution, antioxidant systems such as superoxide dismutase, catalase, and glutathione peroxidase limit damage, while NRF2 activation drives cytoprotective gene expression.
Moving on to proteases.
Proteases released by inflammatory cells degrade extracellular matrix, activate pro-cytokines, and modulate receptor signaling.
Neutrophil elastase, stored in azurophilic granules and released during degranulation or NETosis, cleaves bacterial virulence factors but also host elastin, collagen, and complement components, contributing to tissue destruction in emphysema and abscess formation.
Matrix metalloproteinases, particularly MMP-9 from neutrophils and MMP-1 and MMP-3 from macrophages and synoviocytes, are transcriptionally induced by IL-1 and TNF-alpha and degrade collagen and gelatin, enabling leukocyte migration and driving joint erosion in arthritis.
Cathepsins from macrophage lysosomes process antigens and activate pro-IL-1beta.
The coagulation cascade protease thrombin not only forms fibrin but also signals through PAR-1 to induce endothelial permeability and chemokine production.
And finally, we have histamine.
Histamine is a preformed mediator stored in mast cell and basophil granules and released within seconds of IgE cross-linking, complement activation, or physical stimuli, which is rapidly metabolized by histamine N-methyltransferase and diamine oxidase (DAO).
It acts on H1 receptors to cause vasodilation, endothelial gap formation, and smooth muscle contraction, producing the immediate phase of increased permeability and wheal-and-flare response in urticaria.
H2 receptor activation increases gastric acid secretion and modulates immune responses. In early inflammation, histamine synergizes with lipid mediators to amplify edema and recruits eosinophils via H4 receptors.
Mast cell degranulation also releases tryptase, which activates PAR-2 to further increase permeability and cytokine production.
So:
-Cytokines (TNF-α, IL-1, IL-6, IL-17 etc) -> macrophages and T cells.
-Chemokines (IL-8, MCP-1, RANTES etc) -> macrophages and endothelium.
-Lipid mediators (PGE₂, LTB4, PAF etc) -> macrophages and mast cells.
-ROS / RNS (superoxide, NO etc) -> neutrophils and macrophages.
-Proteases (elastase, MMP-9 etc) -> neutrophils and macrophages.
-Histamine -> mast cells and basophils.
Now, here's a list of common lifestyle factors and conditions that exacerbate systemic inflammation:
-Trans fats that (mainly) increase TNF-α and IL-6.
-A high O6, low O3 ratio in the diet that (mainly) increases PGE2 and IL-8.
-Anything that can lead to endotoxemia will (mainly) increase IL-6, TNF-α and IL-1β.
-Alcohol (more than 1 shot a day) will increase IL-6, TNF-α and IL-1β.
-T2D/high blood sugar can elevate IL-6 and CRP.
-Too much iron can increase IL-6 and CRP.
-Sleep deprivation increases IL-6, TNF-α, CRP.
-Sleep apnea increases IL-6, IL-8, IL-1β.
-Low muscle mass increases IL-6 and CRP.
-Sedentary behavior (>8 h/day) increases IL-6 and TNF-α.
-Chronic stress also increases pretty much everything.
-Mold mycotoxins increase IL-1β, IL-6 and TNF-α.
-A magnesium deficiency increases IL-6, CRP.
-A vitamin C deficiency increases IL-1β.
-A zinc deficiency increases IL-6 and IL-1β.
-A selenium deficiency increases TNF-α.
-A vitamin D deficiency increases IL-6, TNF-α and IL-17.
-Melatonin suppression pretty much also increases almost everything down the line.
-Heavy metals IL-6, IL-1β and TNF-α (but less than mold).
-Overtraining increases IL-6 and IL-1β.
-MCAS also increases pretty much everything.
Now here are some tests you can take in order to "assess" your inflammation "status".
Tier 1: Non-negotiables
-hs-CRP (IL-6 driven) (the reason pomegranate/pomegranate extracts + PQQ are often recommended for cardiovascular health are partly because they lower CRP and IL-6 quite a lot and way more in people struggling with issues such as T2D).
-Vitamin and mineral status (an RBC element test can also be added and vitamin D should be included (even 25-hydroxy vitamin D)).
Then based on the results, you can further dial in your approach after you've covered the common lifestyle factors and conditions that exacerbate systemic inflammation.
OTC tools that you can further look into in regards to inflammation include:
-BPC-157
-Luteolin
-Quercetin
-Whole food vitamin E
-B vitamins
-PQQ
-Aspirin + K1/K2
-CBD
-Glutathione (injectable)
-Ubiquinol
-Taurine
-Curcumin
-Apolactoferrin
-Blackseed oil
Always remember that the kynurenine pathway is crucial in autoimmune diseases.
So it's also crucial for alopecia aerata.
A highly active immune system triggers the enzyme indoleamine 2,3-dioxygenase (IDO), which drives the breakdown of tryptophan into kynurenine metabolites.
Normally, healthy hair follicles possess "immune privilege," meaning they are shielded from immune system attacks.
In conditions like alopecia areata, the dysregulated kynurenine-AhR (aryl hydrocarbon receptor) axis compromises this shield, allowing immune cells (like T-cells) to attack the follicle.
Now in case you have zero clue what the kynurenine pathway is, here's a qucik thread.
The kynurenine pathway is the main metabolic route for breaking down tryptophan, accounting for about 95% of its catabolism (the rest goes to serotonin/melatonin or minor indole pathways).
You might think that this sounds extremely boring, but what if i told you that this pathway is so important that ketamine’s rapid antidepressant effects in treatment-resistant depression are greatly linked to its influence on the kynurenine pathway (the references are presented at the end as always)?
It produces a series of intermediate metabolites collectively called kynurenines with diverse biological effects (some are neuroprotective/anti-inflammatory, while others are neurotoxic/pro-inflammatory), with the end goal being the de novo production of nicotinamide adenine dinucleotide (NAD+).
Now the kynurenine pathway begins with the conversion of tryptophan to kynurenine (KYN), the rate-limiting first step that commits most tryptophan to this metabolic route rather than serotonin or melatonin production.
This conversion is catalyzed by two main enzymes:
-Indoleamine 2,3-dioxygenase 1 (IDO1)
and
-Tryptophan 2,3-dioxygenase (TDO) (also known as TDO2)
These enzymes perform the same biochemical reaction, which is oxidizing the indole ring of tryptophan using molecular oxygen to produce N-formylkynurenine, which is quickly deformylated to kynurenine.
That being said, they differ significantly in traits such as location, regulation and expression.
Yeah, looking at screens as a dude makes you gay.
Here's why 👇
Several neurotransmitters and neuropeptides regulate erections in the penile tissue but also the central nervous system.
Neurotransmitters are chemical messengers released by neurons at synapses.
They directly excite or inhibit the target cell (whether that’s another neuron, a muscle or a gland) by binding to receptors and triggering rapid responses (within milliseconds).
So a neurotransmitter can excite the neuron, inhibit a message or adjust the communication at the synapse.
Now neuromodulators are a bit different as they are not restricted to the synaptic cleft between two neurons, and so can affect large numbers of neurons at once.
Neuromodulators therefore regulate populations of neurons, while also operating over a slower time course than excitatory and inhibitory transmitters.
Some molecules (like nitric oxide or certain peptides) can act as both, depending on context.
These (neurotransmitters and neuromodulators) operate at two levels:
Central (brain and spinal cord): Initiating psychogenic/nocturnal erections via arousal, motivation and autonomic control.
Peripheral (penile tissues): Executing tumescence by relaxing/contracting smooth muscle in the corpora cavernosa.
Psychogenic erections (from thoughts, sights, fantasies) and nocturnal ones involve the limbic system (amygdala, hypothalamus like paraventricular nucleus/PVN and medial preoptic area/MPOA) descending to spinal centers.
Now the pro-erectile (facilitatory) ones include:
Dopamine
Oxytocin
Nitric oxide (NO)
Glutamate
Vasoactive intestinal polypeptide (VIP)
Acetylcholine
The anti-erectile or mixed (inhibitory) ones include:
Serotonin (5-HT)
Noradrenaline
GABA
Opioids
Endocannabinoids
Endothelin-1
Prolactin
The most common “combination” in ED for example is low dopamine + oxytocin that leads to reduced psychogenic drive and excess serotonin/prolactin that inhibits arousal.
Dopamine is arguably the most important central neurotransmitter for facilitating sexual motivation, arousal, and penile erection.
It is synthesized from phenylalanine and tyrosine with the help of phenylalanine hydroxylase and tyrosine hydroxylase.
The steps are:
L-Phenylalanine → L-Tyrosine.
This conversion is catalyzed by phenylalanine hydroxylase (PAH), primarily in the liver. PAH uses tetrahydrobiopterin (BH₄ (see previous parts on this series)) as a cofactor and adds a hydroxyl group to phenylalanine.
Phenylalanine is an essential amino acid (must come from diet), while tyrosine is conditionally essential (can be synthesized from phenylalanine or obtained directly from diet/proteins).
L-Tyrosine → L-DOPA (L-3,4-dihydroxyphenylalanine).
This is the rate-limiting step, catalyzed by tyrosine hydroxylase (TH) in dopaminergic neurons (e.g., in the brain and adrenal medulla).
TH also requires BH₄, oxygen, and iron (Fe²⁺) as cofactors.
TH is highly regulated (by feedback inhibition from dopamine and phosphorylation for example).
L-DOPA → Dopamine.
Catalyzed by aromatic L-amino acid decarboxylase (AADC, also called DOPA decarboxylase), using pyridoxal phosphate as a cofactor.
Now dopamine is involved in motor control, the reinforcement of certain behaviors through reward, motivation, learning, concentration and sleep but when it comes to erections, it acts primarily in the brain to integrate psychogenic and reflexogenic stimuli, bridging libido with the consummatory phase (actual erection and copulation).
Unlike peripheral mechanisms such as NO-cGMP in penile tissue, dopamine’s effects are predominantly central, with key actions in hypothalamic and limbic areas.
It influences erection through three main systems:
Incertohypothalamic system: Dopaminergic neurons from the A11-A14 groups project to the medial preoptic area (MPOA) and paraventricular nucleus (PVN) of the hypothalamus (the primary sites for pro-erectile DA action).
Mesolimbic system: From ventral tegmental area (VTA) to nucleus accumbens (drives sexual motivation/reward).
Nigrostriatal system: More for motor coordination during copulation.
In the PVN, DA activates oxytocinergic neurons projecting to the spinal cord (thoracolumbar and sacral levels), triggering parasympathetic outflow for erection.
The core pathway in the PVN are the following:
DA binds to receptors → increases intracellular Ca²⁺.
NO (via cGMP-independent mechanisms, e.g., protein nitrosylation) activates oxytocinergic neurons
Oxytocin release in spinal cord → pro-erectile parasympathetic signals → penile smooth muscle relaxation and tumescence.
This loop links DA to central NO and oxytocin, explaining why DA agonists induce erections even with NOS inhibitors peripherally.
Non-selective agonists like apomorphine for example, induce erections within 10-25 minutes (sublingually).
When it comes to the dopamine receptors we have 5 (D1, D2, D3, D4, D5 and potentially a D6 (some of the recent literature includes the D6 and some does not)).
They divide into D1-like (D1, D5: stimulate adenylate cyclase) and D2-like (D2, D3, D4: inhibit it).
Pro-erectile effects are mainly via D2-like receptors in the PVN.
Now, when it comes to supporting dopamine production and its receptors in general, the first things you have to do are to:
Provide bioavailable protein, retinol, zinc, P5P, B9, vitamin C, vitamin K, vitamin D and vitamin E.
Avoid overstimulation (D2 receptors specifically are susceptible to downregulation from overstimulation (this is why meditation is shown to increase their density)).
Get some sun and avoid too much artificial blue light since in some animal models its shown to lead to an up to 30% reduction of tyrosine hydroxylase-positive neurons in the substantia nigra.
Monitor stress and relax.
Don’t live a sedentary lifestyle (we are meant to move thought the day which is why even 10 minutes of exercise can increase the density of the D2 and D3 receptors in some cases).
If you can go and measure your prolactin, insulin and androgens (testosterone for example upregulates dopamine (DA) pathways, particularly in brain regions like the nigrostriatal system).
Then, once you’ve addressed these, the supplements that might help you specifically with libido, in case low dopamine plays a role in your case are (note: in case you are struggling with any condition that includes hypomania or in the case you are using an antipsychotic, do not add these without medical supervision):
CDP-chole or uridine, both of which upregulate D2 receptor density/signaling
Sulbutiamine also upregulates D2 receptor density/signaling
Forskolin also upregulates D2 (and D1) but through cAMP elevation
Rhodiola rosea + taurine that enhance dopamine receptor sensitivity (general, some D2 overlap).
Mucuna Pruriens (velvet bean) that’s a natural L-DOPA source (do not use it for more than 3 days at a time (note: if the comedown from it is too strong, you may not have enough B6 in your system)).
So as always, pick the supplement that might also assist other goals you might have.
Other things can help when it comes to dopamine in general, but caffeine for example, which can impact D2 receptors, is a vasoconstrictor so it’s not ideal in the context we are talking about.
Now let’s move on to glutamate.
This is the brain’s primary excitatory neurotransmitter and even though in excess it’s toxic to neurons, it plays a crucial pro-erectile role centrally, particularly in integrating sexual stimuli and activating downstream pathways for penile tumescence.
The primary synthesis (~70-80% of neuronal glutamate) pathway is the glutamine-glutamate cycle.
Here’s a summary.
Glutamine → Glutamate (in neurons)
Enzyme: Phosphate-activated glutaminase (PAG or GLS)
Glutamine (from blood or astrocytes) enters neurons → PAG hydrolyzes it → glutamate + ammonia.
This is the rate-limiting step for neurotransmitter glutamate replenishment.
Astrocytes provide glutamine:
Astrocytes take up synaptic glutamate (via transporters like EAAT1/2) → convert to glutamine via glutamine synthetase (GS) (astrocyte-specific enzyme).
Glutamine released → taken up by neurons → completes the cycle (prevents excitotoxicity and recycles nitrogen).
There’s also an alternative/de novo pathway (α-Ketoglutarate route (~20-30% of glutamate)), utlizied especially during development or high demand:
Or via transamination reactions:
Enzymes: Alanine aminotransferase (ALT) or aspartate aminotransferase (AST)
Example: α-Ketoglutarate + alanine → glutamate + pyruvate.
There are also some supporting pathways from ornithine for example, via ornithine aminotransferase (OAT) (→ pyrroline-5-carboxylate → glutamate (minor in brain)).
Note: Glutamate is not efficiently transported across the blood-brain barrier → almost all neurotransmitter glutamate is synthesized locally in the brain.
So its effects are mediated mainly through ionotropic receptors (NMDA, AMPA/kainate) in key hypothalamic/limbic areas, with NMDA receptors being the dominant player.
Glutamate release surges during sexual activity, facilitating arousal and erection via nitric oxide (NO) and oxytocin pathways.
For example it activates oxytocinergic neurons projecting to the spinal cord, it rises ~170% during mounting/intromission and ~300% at ejaculation.
A quick summary is basically the following:
Sexual stimuli → glutamate release in MPOA/PVN.
Glutamate binds primarily NMDA receptors (coupled to Ca²⁺ channels) on oxytocinergic neurons.
Ca²⁺ influx → activates neuronal NO synthase (nNOS) → NO production.
NO (via nitrosylation or other cGMP-independent paths) activates oxytocin release.
Oxytocin projections to spinal cord → parasympathetic activation → penile smooth muscle relaxation and erection.
Now it’s unlikely that you are struggling with low glutamate so we’ll move on to the next.
Even if you think (which is surprisingly common) that a particular GABA supplement or benzodiazepines led to low glutamate, this is not the case.
The opposite is often the case, where there’s a glutamate rebound/hyperactivity.
9 of my favourite cheap, studied and easily accessible supplements when it comes to better mental health.
Thread🧵
It’s George.
No matter who you are, at some point, you will probably struggle with a "light" mental health issue, whether that's called minor depression, anxiety and so on.
This is totally normal since, in this day and age, we face the following conditions that create the perfect storm for them:
-Everyone grew up in a less-than-ideal environment.
No matter how loving or well-intentioned someone’s parents or caregivers were, the upbringing everyone receives is almost always imbalanced in one way or another.
This is totally normal and this imbalance tends to create both vulnerabilities and strengths.
It’s just that you’ll always be aware of your weaknesses, but you’ll have to discover your strengths.
As a side note, a very foolish attempt to engineer a “perfect” childhood will simply produce a fragile individual rather than a resilient human being with normal flaws.
Paradoxically, some degree of overcorrection is itself a natural part of psychological development.
-Most of the structure of modern life is profoundly unnatural both for our biology but for our minds as well.
From the fact that you can no longer operate at a basic human level and have to master 90 different things just to survive, to overstimulation, constant noise 24/7, high caloric malnutrition, isolation, chronic stress, material overconsumption and the fact that you have to sit in a chair for hours on end, all these create an environment our nervous systems were never designed to handle.
-Your genes no longer match your environment.
Your genes, shaped over thousands of generations in very different environments, no longer perfectly match the modern world we live in.
Variants in genes such as COMT, MTHFR, and MAO have received a lot of attention in recent years for their links to mood, focus, and stress resilience.
It’s important to remember that these variants are not simply “defects.”
Many of them likely played useful roles in ancestral environments.
For example, certain low-activity variants in the MAOA gene are associated with higher impulsivity, irritability, or difficulty concentrating in today’s settings.
In the context of hunter-gatherer or high-threat environments, however, the same traits may have conferred advantages, such as quicker reactions, higher drive, or greater willingness to take risks in hunting, competition, or defense.
Similar trade-offs exist with other genes.
The COMT Val158Met variant influences dopamine levels in the prefrontal cortex, with different alleles potentially favoring either stress resilience (“warrior” strategy) or cognitive performance in stable conditions (“worrier” strategy).
MTHFR variants affect folate metabolism and may have offered advantages related to fetal viability or cancer protection in certain historical dietary contexts, even while increasing risks in others.
In short, what feels like a liability today was often an asset yesterday.
-We are trying to pathologize as many things as we can for profit.
In some contexts for example, not experiencing problems such as anxiety and depression can be problematic.
These feelings and situations by themselves should not be pathologized out of a certain context.
Let’s say that my mom has to undergo a routine surgery in a month.
Not feeling the tiny bit of anxiety or worry is as pathological as feeling anxiety to the point of me not being able to eat, sleep or focus on work.
And this is of course without even mentioning issues suchas that technological innovation has reached the point of quite literally driving some people mad and inducing psychosis.
Almost everyone these days (even seemingly fit people) seems to have the combination of:
-High LDL
-Low HDL
-High blood pressure
-High triglycerides
Now, even if one of these markers in isolation might not be as problematic as it is advertised, this combination is in fact quite problematic.
So here's how you can start managing it.
Thread 🧵
First and foremost, let's start by breaking down cholesterol to a basic degree.
As we’ve said multiple times, cholesterol is a 27-carbon steroid alcohol with the systematic name cholest-5-en-3β-ol.
It has four fused rings (A, B, C, D), a hydroxyl group on carbon 3, a double bond between carbons 5 and 6, methyl groups on carbons 10 and 13, and an eight-carbon iso-octyl side chain on carbon 17.
Every animal on Earth needs it.
Plants, fungi and bacteria make zero cholesterol.
Your liver alone synthesises 800–1,200 mg daily even if you eat none, because every single one of your 37 trillion cells requires it for survival.
Its key functions include:
-Cell-membrane integrity.
Cholesterol molecules sit between phospholipid tails, preventing crystallisation at low temperature and excessive fluidity at high temperature.
-Precursor for every steroid hormone.
-Vitamin D synthesis 7-dehydrocholesterol in skin is converted to previtamin D3 by UVB, then to vitamin D3.
Low skin cholesterol = low vitamin D production.
-Bile-acid synthesis.
Cholesterol is converted to 7α-hydroxycholesterol by CYP7A1, then to cholic acid and chenodeoxycholic acid.
These are conjugated to glycine or taurine and secreted into bile.
Without bile acids you absorb almost no dietary fat or fat-soluble vitamins.
-Myelin sheath.
Myelin is seventy percent lipid by dry weight, and cholesterol is the major lipid (25% of total body cholesterol is in the brain, mostly in myelin).
-Synaptic vesicles/neurotransmitter release.
Neurotransmitter release requires cholesterol-rich lipid rafts for vesicle fusion.
Too little cholesterol = impaired acetylcholine, GABA, and dopamine release.
Revealing the root causes of hair loss (with actual proof).
An entire guide on understanding the common myths, realities, the real root causes and what to do about them.
Thread🧵
It’s George.
First and foremost, losing some hair as the years go by is normal.
We can't look at 70 like we did at 25 and believe it or not this is not common sense these days and the demands to avoid any sign of "ageing" are at an all time high because anything that can cause a negative emotion, is avoided and masked like the plague.
So, some hair loss if you are older, is fine.
BUT, younger and younger people are losing their hair and in A LOT of the cases, no one in the family had a history of premature hair loss.
So, if you just recently started noticing your hair falling off a bit, immediately address these because you might as well stop it within even a couple of months compared to the daily effort you'll have to put forever if you let it get worse and worse.
Now this thread will basically provide you with the MOST effective strategies you can use to manage premature hair loss.
If you find it helpful, make sure to leave a like.
Let’s start by stating the following: there’s no “one thing” that causes all types of hair loss all the time.
Sorry.
It’s a myth capitalised to sell whatever magic solution is trending at the time, at best, and usually a symptom of someone mistaking byproducts as the root cause of the problem.
Hair loss is driven by a complex interplay of genetics, hormones, certain lipid compounds, environmental factors and a few more things that we discuss in this thread.
Yet it goes unrecognized quite frequently, even though it’s a common driver behind issues such as:
-Chronic fatigue
-Brain fog
-Skin issues
-Hormonal imbalances
-Autoimmune conditions
-Mental issues such as generalized anxiety and depression
-Systemic inflammation
If you still think that SIBO can't be one of the primary drivers behind your health issues, think again since:
-At least half of the people who’ve used PPIs or antibiotics have it.
-Most people who eat the S.A.D have it.
-Up to 78% of people an IBS diagnosis actually just have SIBO.
-Sibo is present in up to 50% of hypothyroid patients.
and there's more as you will see in this thread.
So without further ado, here’s the ultimate guide for conquering SIBO 🧵
*Standard disclaimer that nothing in this thread should be used as a substitute for medical advice*
It's George.
Let's start with the basics.
SIBO or small intestinal bacterial overgrowth is a well, almost a self-explanatory condition that marks an abundance of bad bacteria, such as the ones belonging to the firmicutes, bacteroidetes or proteobacteria phyla families overgrow in the small intestine.
The problem with this is that the small intestine and its parts, such as the duodenum, jejunum and ileum, are designed for nutrient breakdown and absorption, not bacterial fermentation.
Normally, it hosts fewer than 10^3 colony-forming units (CFU) per mL of bacteria, compared to 10^9–10^12 CFU/mL in the colon.
When this balance is disrupted, bacteria ferment carbohydrates for example, producing gases like hydrogen, methane or hydrogen sulfide.
These can drive symptoms such as bloating, abdominal pain and altered bowel movements (diarrhea, constipation and so on).
But SIBO is not just a gut issue.
It has systemic effects, including nutrient deficiencies, systemic inflammation and neurological symptoms for example.
Overall, some symptoms of SIBO to look out for include:
-Bloating and gas (especially 30–60 minutes post-meal).
-Very frequent constipation or diarrhea.
-Too many food "intolerances" all of a sudden.
-Abdominal pain or cramping.
-Acid reflux or nausea.
-Low B12 and high B9.
-Chronic fatigue paired with brain fog.
-Skin issues.
-Your autoimmune disease/s becoming way worse all of a sudden.
-Histamine intolerance/MCAS.