Yes: Tyrosine is an essential amino acid medically important for people with phenylketonuria, as they are missing the enzyme which converts phenylalanine to tyrosine. It may possibly be effective in helping alertness for several hours when sleep-deprived. See http://www.m.webmd.com/vitamins/ai/ingredientmono-1037/tyrosine/source-3
Answered 7/24/2015
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