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Tyrosine (symbol Tyr or Y) or 4-hydroxyphenylalanine is one of the 20 standard amino acids that are used by cells to synthesize proteins. It is a non-essential amino acid with a polar side group. L-Tyrosine Crystalline Powder is a dietary supplement that is commonly used to improve cognitive function, reduce stress, and enhance athletic performance. It is an amino acid that is naturally produced by the body and is also found in certain foods. L-Tyrosine Crystalline Powder is often used by athletes and bodybuilders to improve endurance and reduce fatigue during intense workouts. It is also used by individuals who are looking to improve their mental focus and concentration, as well as those who are experiencing symptoms of stress or anxiety.