I think a bunch of places you're saying intraspecies, you meant interspecies? ("Intraspecies differences" would, I think, be variation amongst members of one species? Interspecies would be between different species. Unless the terms are being re-interpreted somehow in the context of this biochemical / pharmaceutical usage...)
Chris Masterjohn thinks humans also benefit from glycine supplementation (based mostly on extrapolation from deficiencies).
https://chrismasterjohnphd.substack.com/p/startled-try-glycine
Hold onto that beautiful hypothesis!
I think a bunch of places you're saying intraspecies, you meant interspecies? ("Intraspecies differences" would, I think, be variation amongst members of one species? Interspecies would be between different species. Unless the terms are being re-interpreted somehow in the context of this biochemical / pharmaceutical usage...)
Just fixed, thanks :D