The “L” form of tyrosine is the biologically active form in humans. Sometimes tyrosine is sold under the chemical name N-acetyl-L-tyrosine, or NALT, a more water-soluble form, explains Dr.

Tyrosine supplementation can be found in its free form. It can also be found as N-acetyl L-Tyrosine (NALT). The conversion rate of NALT to tyrosine is lower so some may take higher doses of NALT.

L-tyrosine, categorized as a non-essential amino acid, is critical in creating neurotransmitters like dopamine, adrenaline, and noradrenaline. These are crucial to controlling mood, managing ...