Tyrosine is conditionally an essential amino acid and the precursor to dopamine.

Dopamine is responsible for helping to modulate body movements and emotional states 

Tyrosine has been shown to increase dopamine levels in the brain and this is accomplished through the enzyme known as tyrosine hydroxylase which is an iron containing enzyme that transfers oxygen from the blood into L-Dopa. L-Dopa is converted into dopamine. 

take 1 tablet with a meal.