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.
glycine. so if anyone is aware of cron there was a study which showd methionine restriction seemed to have a similar effect and a further study that glycine which helps eliminate glycine to do so as well as a supplement. Mouse studies though (not cron which has more data but the others are like one study each last I saw.)