NITRIC OXIDE SUPPLEMENTS These supplements often consist of a form of the amino acids arginine and citrulline and the substance agmatine. They claim to increase the body’s production of a substance called nitric oxide. Nitric oxide widens blood vessels and thus enables more oxygen and nutrients to get to the muscles, which can improve performance. While this sounds like just another dubious marketing pitch, there are studies to support some of these ingredients and claims, but again the problem comes back to dosages.62 You’ll often find nitric oxide-boosting molecules in pre-workout products,
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