Haidut's post is "tryptophan (serotonin) depletion in brain (and elsewhere)". I've never heard of RP mentioning/advocating for zinc supplementation. My old doctor had me on zinc too so your not alone. That's probably another reason I was greying so fast!mamaherrera said:and yes I can't find the thread on lowering tryptophan. . . . . I know gelatin and yogurt and cheese (because they have calcium with the tryptophan) but what else??? Or please share me the thread!