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Discover the best nitric oxide–boosting supplements of 2025, RD-recommended for energy, heart health, and muscle recovery, including brands like Blonyx and Double Wood Supplements.

What Is L-Arginine? L-arginine is an amino acid your body uses to create proteins, glutamate, creatine, proline, urea, polyamines and nitric oxide.

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Health Benefits Although L-arginine may benefit the heart, it is not beneficial in all circumstances. One clinical trial tested whether L-arginine would help people recover from a heart attack.

Such trials would provide more reliable evidence for the use of L-arginine as a treatment for spinocerebellar ataxia and may clarify its long-term safety profile in this population.

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Arginine is an amino acid that plays a part in various bodily functions. Learn which 5 foods to eat to get more arginine.