It's an open secret among functional medicine doctors, but only slowly filtering out to the general public: Supplementing with the naturally occurring amino acid 5-Hydroxytryptophan — 5-HTP for short ...
The amino acids 5-hydroxytryptophan (5-HTP) and l-tryptophan are precursors of serotonin. 5-HTP is generally recommended over l-tryptophan because it crosses the blood-brain barrier at a higher rate, ...
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