Amino acids are required for protein synthesis and are used by the body to build and repair and growth of muscles, bones, organs, glands, connective tissue and hair. Amino acids also act as neurotransmitters and as precursors to neurotransmitters in the central nervous system.
Amino acid complex formulas combine numerous amino acids into one tablet or capsule. This may make getting the necessary amounts easier than having to take a number of individual products. The amino acid complex formulas typically include essential amino acids like L-Arginine, L-Lysine, and L-Phenylalanine. The L form of amino acids represents the natural type found in living plants and animal tissue.
Low levels of certain amino acids have been found in humans with Rheumatoid arthritis, while other amino acids that convert into "excitotoxins" such as glutamine (which converts to glutamate), and aspartate, may contribute to the arthritic inflammation.