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iHerb Customer Reviews



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Improves Dopamine

Posted by truevitality on Nov 12, 2012

L-Tyrosine,is a precursor to Dopamine a major neurotransmitter in the brain. Thorne is a brand I trust as it has no harmful excipients.

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Great product

Posted by 5335608267849999773 on Sep 18, 2013

Thorne research is a good brand and tyrosine is like coffee for my add symptoms

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