Free-form amino acid combination. Arginine supports muscle metabolism, energy, heart function and circulation. Arginine easily converts into nitric oxide (NO).* Suggested Use: 1 tablet four times daily. Well Made Supplement. Contains no yeast, dairy, egg, gluten, corn, soy, or wheat. Contains no sugar, starch, preservatives, or artificial color, flavor, or fragrance. Over 40 Years of Trust. Source Naturals was created in 1982 by CEO Ira Goldberg to support everyone’s potential to enjoy optimal health. Manufactured in the USA. Manufactured in Scots Valley, CA, under the Good Manufacturing Practices (cGMPs) established by the US Food and Drug Administration (FDA).