NOW 5-HTP (5-hydroxytryptophan) is a metabolite of the amino acid tryptophan. You may know tryptophan as the agent in turkey that makes you feel like taking a nap after Thanksgiving dinner (in addition to a full belly). NOW 5-HTP is a direct precursor of the important inhibitory neurotransmitter serotonin, which is secreted in response t
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best value
I've been taking 5-HTP for a while and I think that NOW brand is the best value.