Arginine and citrulline are two amino acids that are an integral part of protein metabolism and utilization, as well as for the maintenance of muscle tissue. They are key intermediaries in the urea cycle, where they participate in the detoxification of ammonia through the production of urea. Additionally, any arginine that is not converted to urea enters the general circulation where it is distributed to various tissues and metabolized for other uses, such as protein synthesis. It is recommended to take 1 capsule 2 times a day. Only for adults. Consult your doctor if you are pregnant or breastfeeding, if you take medications (especially antihypertensives, nitrates, or other heart medications), or if you have a medical condition (especially herpes, kidney failure, and / or glaucoma). Keep out of the reach of children. Not made with wheat, gluten, soy, corn, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients that contain these allergens. Natural color variation may occur in this product. Store in a cool, dry, dark place after opening.