L-Arginine is a semi-essential amino acid derived from protein. The amino acid is known to fitness enthusiasts as a pre-cursor of nitric oxide and is widely used in pre-workout products.
L-Tyrosine is a non-essential amino acid, but is considered semi-essential by many nutritionists. Tyrosine is made from Phenylalanine and is a precursor of various endogenous substances.
Glutamine is the amino acid for muscle recovery and building. Immediately after training, the body has an increased need for amino acids to repair the muscles and to create new muscle fibers.
