D-phenylalanine

[Onemorestep]

Does anyone know anything about this supplement? It's supposed to inhibit the breakdown of endorphins via enzyme blocking. But is there tolerance? Withdrawal? I can find very little about this stuff but it helps a lot with my sleep and pain issues. I'm just wary of messing with things I don't understand... withdrawal sucks 

[brendan]

tried it, didn't notice any effects.

[Onemorestep]

Yea I don’t notice much of anything either tbh. DL-phenylalanine used to provide  some measure of relief but not so much anymore for whatever reason.