What It Is

L-Arginine is an amino acid found in protein foods such as meat, fish, nuts and seeds. The body also makes it.

Why It Is in Formulas

The body uses it to make nitric oxide, which helps blood vessels relax, so it is popular in sports and vitality supplements.

What Research Shows

Studies on supplemental arginine for performance are mixed, and results depend on the dose and the person.

Cautions

It can lower blood pressure and may interact with blood pressure drugs, nitrates, erectile-dysfunction medication and blood thinners. People with heart conditions should ask a doctor first.

See the full Horse Peak Gelatin ingredient breakdown, learn how Horse Peak Gelatin works, or read verified reviews. Horse Peak Gelatin is a dietary supplement and is not intended to diagnose, treat, cure or prevent any disease.

Talk to your doctor first if you take medication or have a heart, blood pressure or hormone-related condition. L-Arginine may interact with blood pressure medication, nitrates, erectile-dysfunction drugs and blood thinners, Tribulus may affect blood sugar and blood pressure, and Zinc can interfere with some antibiotics. Gelatin is typically animal-derived, so check the label if you avoid animal products. Do not stop or change any prescribed medication because of a supplement. Chest pain, dizziness, a very painful or prolonged erection, or sudden changes in energy or mood need prompt medical attention, not a supplement.

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