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L-Arginine is an essential amino acid necessary for lean muscle mass, increasing sperm count, immune system function, detoxifies amino, liver detoxification and aids in malignant diseases with added Ornitine. Twinlab L-Arginine & L-Ornithine are free form Amino Acids. Twinlab L-Arginine & L-Ornithine Capsules are easier to swallow and assimilate and are well tolerated by most highly allergic individuals.