Amino Acids - Arginine - Source

L-arginine is found in brown rice, carob, coconut, dairy products, gelatin, meat, oatmeal, oats, nuts, raisins, sesame seeds, soy, sunflower seeds, wheat germ, whole wheat, and all protein-rich foods.

L-arginine is available as part of a multi-amino acid complex and in protein powder supplements. Depending on the country in which you live, arginine may also be available as an isolated supplement in capsule or tablet form. You may require a prescription.