Source Naturals L-Tyrosine, 500mg, 100 tablets


L-tyrosine is a “conditionally essential” amino acid that can be converted in the brain into the neurotransmitter dopamine (L-tyrosine can cross the blood brain barrier).1 L-tyrosine is also a precursor for the adrenal hormones norepinephrine and epinephrine.1 These can all be depleted by stress, overwork and certain drugs.2, 3 By replenishing these in the brain, one may experience increased mental energy and focus.2,3 L-tyrosine also acts as a precursor to thyroid hormones, the skin and hair pigment melanin, and pain modulators known as enkephalins.4 L-tyrosine deficiency may contribute to gray hair, low thyroid hormone levels, and mental fatigue.

500mg tablets – 100 count

Take 1 -2 per day or as needed.

Out of stock

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Full ingredient list: L-tyrosine 500 mg per tablet. Also includes: dibasic calcium phosphate, stearic acid, sorbitol, silica, magnesium stearate , and modified cellulose gum.

To report a serious adverse event or obtain product information, contact 1-866-280-2852.


1. Gropper, S. A. S., Groff, J. L., & Smith, J. L. (2009). Advanced nutrition and human metabolism. Belmont, CA: Wadsworth, Cengage Learning, pp 214.

2. Deijen JB, Wientjes CJ, Vullinghs HF, Cloin PA, Langefeld JJ. Tyrosine improves cognitive performance and reduces blood pressure in cadets after one week of a combat training course. Brain research bulletin. 1999; 48(2):203-9. [pubmed]

3. Deijen JB, Orlebeke JF. Effect of tyrosine on cognitive function and blood pressure under stress. Brain research bulletin. 1994; 33(3):319-23. [pubmed]

4.Nelson, D. L., & Cox, M. M. (2008). Lehninger Principles of Biochemistry (5th ed.). New York, New York: W. H. Freemam, pp 906, 906-911.

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