L-tyrosine is a protein amino acid and is classified as a conditionally essential amino acid.  (It can be synthesized from the amino acid phenylalanine). It’s one of the many reasons yogurt is good for you!

According to Ray Sahelian, M.D.

Phenylalanine and tyrosine are sometimes prescribed as antidepressants, usually in combination with other nutrients and herbs that have mood elevating properties. Some doctors also recommend these amino acids for appetite control.


According to Evitamins.com, most people should not supplement with L-tyrosine.  If you’re thinking of taking L-tyrosine, check with your doctor first.