L-tyrosine is a nonessential amino acid (protein building block) that the body synthesizes from phenylalanine, another amino acid.
It is found in many protein containing foods, such as meats, dairy products, fish, wheat and oats.
Phenylalanine and L-tyrosine are sometimes prescribed as antidepressants, usually in combination with other nutrients and herbs that have mood elevating properties. Some doctors also recommend these amino acids for appetite control for weight loss.
L-tyrosine produced by skin cells are made into melanin. Although there hasn't been any scientific evidence that L-tyrosine can help you get the best tan without some UV Rays exposure. Remember that only UV Rays exposure triggers our skin to produce melanin.
According to my research, there are no known serious side effects. It is not known, however, whether or not long term use of L-tyrosine, most especially in large amount of more than 1,000 mg is safe, so you should seek advise from your doctor.
L-tyrosine alone may not give you the shade of tan you'll want, actually it may not give you a noticeable tan at all. So if you're taking L-tyrosine as a supplement which contain pure L-tyrosine, you might not notice a difference in your skin. I recommend an L-tyrosine tanning pill with copper and beta carotene.
My personal take on L-tyrosine, it alone does not give you the best tan, it does not produce melanin because our skin only produce melanin when exposed to the UV rays, however I strongly believe that it is a good tanning accelerator so you must use it in combination of other other chemicals, vitamins or lotions or a bit of sun tanning.
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