Skip navigation

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Your search for "5-methoxytryptamine" OR Choline OR Dopamine OR Glutamic Acid OR Glycine OR Histidine OR Levodopa OR Melanin Synthetic "tyrosine," AND Peroxide OR Melatonin OR Norepinephrine OR Octopamine OR Oxitriptan OR Phenylalanine OR Serotonin OR Taurine OR Tryptophan OR Tyrosine did not return any results.
Your search may be too specific. Try using fewer or broader search words.