D-phenylalanine (enkephalinase inhibitor)
Interesting substance, its one of the few dextro (right-spinning optical isomer) amino acids that you can process or something.
I think its fascinating because its purportedly an endorphin reuptake enkephalinase inhibitor? or something so its potentially quasi-opioidergic. I’m not sold on the notion its legit but its definitely a provocative idea.
calorie restriction with optimal nutrition. walford used it when an emergency happened in biosphere and its been done up to monkey levels so its pretty well studied. He was following it himself but died to a genetic disease.