A member asked:

How long will it take to effects of l-tyrosine?

A doctor has provided 1 answer
Dr. Glen Elliott answered

Specializes in Child Psychiatry

Unknown: Assuming it has any effect on adhd, which is not established, it could take weeks or months to have any notable effect, since you are trying to build up brain supplies in the right areas high enough to overcome a presumed deficit in Dopamine or norepinephrine. My professional opinion is that it is highly unlikely one would get a marked effect, ever.

Answered 4/13/2016

5.7k views

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