Bryan Johnson Profile picture
Oct 22, 2024 12 tweets 6 min read Read on X
Genetically, I should be bald.

I started to lose my hair and go gray in my late 20s.

Now, at 47, I’ve got a full head of hair and ~70% of my gray is gone.

Here how I did it.. 🧵 Image
Contrary to popular belief, you can maintain your hair well into your 40s and beyond.

In 12 months, I went from a Norwood 3 to a Norwood 2. Norwood is a hair loss scale, as indicated in the image.

Here’s how I achieved these results:
Image
1. Start early:

Don’t wait for visible loss.

Many lose up to 50% of their hair before they even realize it.

The best time to work on your hair is before you start losing it. Sources (1) (2)
2. Nutrition:

Make sure you're getting adequate:

+ Protein: including collagen peptides and sufficient methionine, cyteine, and lysine in addition to taurine, to support collagen, keratin, and elastin synthesis. Ref (3)

+ Omega-3 fatty acids: for antioxidant effects and improving scalp circulation. Ref (4)

+ Key vitamins & minerals: including iron, selenium, and biotin. Ref (3)

The Blueprint stack has all of these. ↓Image
3. Customized topicals:

I use a personalized Rx formula based on my genetics to prevent and reverse hair loss. Roots byGA (5)

Here are the ingredients in my formulation: Minoxidil (7%), Cetirizine HCl (1%), Latanoprost (0.004%), Dutasteride (0.25%), Melatonin (0.1%), Caffeine (0.2%), Tretinoin (0.0125%), Vitamin D3 (1,000IU/ML), Vitamin E (10 IU/ML).

5% minoxidil is a solid budget alternative. Apply 1 mL to scalp at night or in the morning (or both), massage thoroughly.

Note that some people experience side effects with a topical such as itchy skin, headaches etc. so monitor for those.
4. Red light therapy:

Six minutes a day and you can be doing your morning routine as you wear it. A study on 44 males (age 18-49) showed that treatment with 655nm laser cap for 25 min every other day for a duration of 16 weeks resulted in a 39% increase in hair growth compared to placebo. Ref (6)

An affordable Blueprint red light cap coming soon.
5. Oral minoxidil:

I take 3.75 mg a day. I started with 2.5 mg and evaluated for side effects.

In a double-blind, placebo-controlled randomized clinical trial involving 90 men with androgenetic alopecia AGA, oral minoxidil (5 mg daily) was found to have similar efficacy to topical minoxidil (5% solution applied twice daily) after 24 weeks.Ref (7)

Oral minoxidil is generally considered safe at low doses, but it can have side effects such as hypertrichosis (excessive hair growth) and headaches.Image
When starting any new hair regimen:

+ Start slow
+ Introduce 1 product at a time
+ Monitor closely for side effects
+ Give each addition 3 months to show results
+ 5% minoxidil alone is sufficient for many
+ Consider personalization based on your genetic profile, health, diet type and nutritional condition to reverse any deficiencies (e.g. omega3, protein...) revealed by blood testing.
In December, I'll have a hair growth serum for you. I've been experimenting and refining the formulation for two years.
A final note that I’m in touch with several companies that are building novel hair regrowth therapies. They are promising and exciting.

They’re still years out but it’s cool to think that hair loss may no longer be a thing we have to think about. Just one reason why the future is going to be amazing. #dontdie
For my full protocols and guides visit Project Blueprint here:

blueprint.bryanjohnson.com/pages/blueprin…

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More from @bryan_johnson

May 7
Is sauna worth the hype?

There's evidence that sauna is a potential detox and longevity intervention with benefits to heart, metabolism, brain health, and skin. We’re going to put it to the test.

Here’s what you need to know…🧵 Image
0/ How it works…

Heat exposure in a sauna puts your body under mild stress, triggering natural repair processes that improve overall health. Finnish dry saunas specifically use controlled heat to stimulate these beneficial responses, including:

+ Repairing and maintaining proteins (heat shock proteins)
+ Improving blood flow and relaxing blood vessels
+ Boosting antioxidant activity
+ Optimizing metabolism
+ Enhancing fitness
+ Reducing inflammation
+ Strengthening immunity
+ Recycling and repairing cells (autophagy)

All these processes combine to give whole-body health benefits.Image
1/ It protects your heart…

Regular sauna use (4–7 times a week, sessions lasting at least 19 minutes) can significantly improve heart health and lower blood pressure. Research shows the more often you sauna, the greater your protection from heart disease:

Heart disease risk:
2–3 times/week → 23% lower risk
4–7 times/week → 48% lower risk

High blood pressure risk (in healthy men aged 42–60):
2–3 times/week → 17% lower risk
4–7 times/week → 47% lower risk

In patients with existing heart failure, using a sauna 5 times a week for 3 weeks improved heart function by nearly 7%, lowered stress hormones by 25%, and reduced heart failure markers by over 20%. Longer and more frequent sauna sessions offer the strongest protection.Image
Read 11 tweets
Apr 30
This marker reveals how fast you’re aging.

+ New science just emerged to support it
+ It’s based on DNA methylation
+ It allows me to know what is and isn’t working

Here’s an overview of how:
+ it works
+ you can find out your result
+ you can compare your results to others Image
0/ Speed of aging (PACE) is one of the most clinically validated aging markers.

My team and I use it extensively to measure the efficacy of health protocols.

This thread explains how biological aging clocks gained a bad reputation and how two new pre-prints take a new approach to restore confidence to the field.
1/ Addressing Skepticism:

There's been some skepticism surrounding biological age clocks. I'm going to address the arguments around epigenetic age measurements, explain why these concerns don't apply to PACE (the clock my team and I use), and discuss the new standards emerging in the field to ensure the reliable validation of these tools.

Key Takeaways:

+ Early studies often lacked rigorous methodologies in their application of biological aging clocks.

+ The field is now developing new, robust benchmarks for validating and utilizing biological aging clocks effectively.

+ Strong clinical evidence shows that PACE meets the stringent criteria for accuracy, reliability, and sensitivity.
Read 10 tweets
Apr 21
My Vit D levels spiked 235% post HBOT.

My Vit D has been stable for years ~40 ng/mL and then spiked to 134 ng/mL after 60 sessions of HBOT.

For context: I’ve been taking ~5000 IU/day of Vit D for the past few years. My serum levels have consistently hovered around ~40 ng/mL.

Sep 2024 (pre-HBOT): 40 ng/mL
Jan 15, 2025: 67.8 ng/mL
Mar 26, 2025: 110 ng/mL
Apr 1, 2025: 134 ng/mL

Levels approaching 100 ng/mL can carry potential benefits. Beyond that is not ideal.

The threshold of toxicity sits around 150 ng/mL, and while I’m still comfortably below it, I’ve chosen to pause my 5000 IU/day dose to try and normalize levels.

I’m not concerned. Bone health is excellent (top 99.8 percentile via DEXA) and my serum calcium (9.4 mg/dL) is within the upper normal range.

So why did Vit D levels spike? We have a hypothesis.
🧵Image
1/ Improved intestinal bile acids

Through reversal of dysbiosis and increased growth of healthy gut bacteria.

How does it affect vitamin D?

Bile acid metabolites (especially LCA) promoted by a healthy microbiome promote vitamin D absorption into circulation.
2/ Improved intestinal barrier integrity and reduced inflammation

Increases in Akkermansia and butyrate support mucin production and maintain healthy gut lining.

How does it affect vitamin D?

A strong mucus layer prevents nutrient loss through inflammation-induced “leaks” and promotes efficient absorption into the bloodstream.

Reduced intestinal leakage also means less systemic inflammation, which decreases immune-cell consumption of vitamin D. More circulating vitamin D, less wasted in fighting fires.

That creates a positive feedback loop:
Less inflammation → More available vitamin D → Even less inflammation → Repeat.
Read 6 tweets
Mar 25
I take 2.5 mg of Cialis daily.
Not for erections, but for longevity.

Here’s what the science says about Cialis and lifespan extension…

And why it’s not the reason behind my 3 hour long titanic nighttime erections.
🧵
0/ It sounds wild, but low-dose Cialis (tadalafil) and Viagra (sildenafil) are both drawing attention for longevity benefits.

Recent clinical evidence indicates the use of either correlates to longer survival in men, in addition to their potential for heart health, metabolism, and even brain function.

A new retrospective study evaluated the longevity potential of 407 prescription drugs in over 200,000 participants, with both Cialis and Viagra being among the surprising promising hits in men (yet to be evaluated in women, since the retrospective studies only cover existing drug use for established indications).

Sildenafil will soon be tested in the NIA’s ITP, the most credible pre-clinical longevity drug testing program in mice.Image
1/ My nighttime erections are better than the average 18 year old, but Cialis is unlikely to play a meaningful role in them or even my sexual function.

While it’s true that daily low-dose Cialis (2.5–5 mg) can help men with erectile dysfunction (ED) or benign prostatic hyperplasia (BPH) by maintaining steady blood levels of the drug, the primary benefit is in restoring minimal normal erectile function, not enhancing already healthy sexual performance.

In one study, men with ED taking 5 mg/day of tadalafil showed an average increase of 17.75 minutes in nightly Duration of Erectile Episodes (DOEE). This threshold was considered predictive of a successful response.

My dose is half that, 2.5 mg.

However, this effect is likely limited to individuals with existing ED, as the drug appears to normalize function, not boost it. Even then, the increase is relatively modest, less than 10% compared to my typical nighttime erections lasting over 3 hours.

Another study found that 12 weeks of 5 mg/day tadalafil had no significant effect on the duration of nighttime erections, though participants reported increased confidence and improved spontaneous morning erections.Image
Read 9 tweets
Mar 19
Study uses MRI ad machine learning to estimate brain age, and identifies 64 “druggable” genes that drive brain agingImage
0/ Published last week in @ScienceAdvances a study reported the use of brain scans with multiple deep learning models combined with gene expression analysis in blood samples and brain tissues from to identify genes that drive brain aging.
Background and details

1/ The study used brain scans and gene expression analysis data from 38,961 subjects from the UK Biobank, 6637 of which with a diagnosed brain disorders with “healthy” brains.
Read 11 tweets
Mar 19
My sperm quality equal to a healthy 20-year-old.

+ sperm 330 million
+ motility 53%
+ motile sperm 175 million
+ morphology 10% normal

Sperm health predicts testosterone, metabolic health, disease, addiction, and life expectancy. 

Here’s what you need to know.🧵 Image
0/ I have more motile sperm than the average healthy 22-29 year olds and much higher than the average fertile US man (104 million motile sperm count for the US father, age 32∓6 years).

Image above of my sperm is from a 2023 test. Image
1/ Sperm quality predicts health and longevity

Beyond predicting infertility, poor sperm quality also correlates with poorer health, higher incidence of age related disease, and premature death. While a total motile sperm of 20 million is enough for fertility, this number is a minimum that does not necessarily reflect good health.
Read 7 tweets

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