ok im gonna do a thread because i want to further analyze the Combine's crude & cheaply-made insectoid alien biotechnology.
a good example is the antlion "milking" station from HL:alyx where these alien insects are being drained of some useful bodily fluid like horseshoe crabs
we learn the green goo from antlion grubs can heal you. how does the combine use this? do they process it on industrial scale? do they bioengineer something else to make the goo? Nope! each health kit comes preloaded with a single live grub which gets blended & injected into you