L Tyrosine is a non-essential amino acid, which plays an important role in the production of the neurotransmitters dopamine and norepinephrine. Tyrosine is also a precursor to thyroxine and triiodothyronine and the pigment melanin. A hard training athlete/bodybuilder may benefit from supplementing with L Tyrosine. STORAGE INSTRUCTIONS Store in a cool and dry place. NOTE! Do not exceed recommended dose. Supplements are not intended to replace a varied diet. Keep out of reach of children. Store in a cool dry place. See best before date on packaging. If you are pregnant, nursing, have a diagnosed illness or are using prescription medication, consult your doctor before using any supplement.