L-Tyrosine, is not an essential amino acid since it can be made from the amino acid phenylalanine. L-tyrosine is a nonessential amino acid. L-tyrosine, through its effect on neurotransmitters, may affect several health conditions, including Parkinson’s disease, depression, and other mood disorders.
L-Tyrosine is converted by skin cells into melanin, the dark pigment that protects against the harmful effects of ultraviolet light. Mental retardation and other severe disabilities can result. While dietary phenylalanine restriction prevents these problems, it also leads to low tyrosine levels in many (but not all) people with PKU. Some people affected by PKU are deficient in tyrosine. Tyrosine levels are occasionally low in depressed people.
L-tyrosine has not been reported to cause any serious side effects. L-Tyrosine as a food additive is a direct precursor to Thyroxine, a primary thyroid hormone, as well as Adrenaline and Nor-adrenaline. L-Tyrosine has been found to assist in optimizing thyroid hormone levels, increased mood, concentration, and productivity. It can also improve endurance under stress and is effective as an appetite suppressant.
L-Tyrosine is the precursor of the catecholamines; alterations in the availability of L-tyrosine to the brain can influence the synthesis of both dopamine and norepinephrine in experimental animals and probably in humans. The main effects of L-tyrosine that have been reported are acute effects in preventing a decline in cognitive function in response to physical stress.
Others: Taurine Chlorogenic acid
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