L-tyrosine

L-tyrosine is a non-essential amino acid, meaning the body can produce it on its own. It is found naturally in many protein-rich foods like meat, fish, dairy, and legumes. It can also be produced industrially through fermentation or chemical synthesis.

L-tyrosine is often added to foods and dietary supplements as a source of this amino acid. It is found in energy drinks, protein powders, and some medical foods, where it is thought to support cognitive function and mood.

In the US, L-tyrosine is generally recognized as safe (GRAS) by the FDA when used as intended. It is a building block for important neurotransmitters and hormones. International bodies like JECFA have evaluated amino acids, but specific evaluations for L-tyrosine's use as a food additive may vary. Research on its cognitive benefits at typical intake levels is ongoing, with some studies showing potential but more research needed.