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N-acetylcysteine (NAC) is a derivative of the amino acid cysteine. This page reviews oral supplementation studies for training-related goals.

Aloe vera is a plant; inner gel, gel powder, sterols and topical products differ in composition and use.

Alpha-galactosidase is a digestive enzyme that breaks down certain oligosaccharides in legumes and other foods.

Arginine is an amino acid. L-arginine and the AAKG complex have different compositions; products containing amino-acid mixtures are considered…

Astaxanthin is a carotenoid. The amount of astaxanthin itself and the extract composition matter when comparing products.

Oats (Avena sativa) are used as a food grain, a source of β-glucan and raw material for green herb extracts. These products differ.