Citrulline is a non-essential amino acid that is an important intermediate in the urea cycle, functioning along with other amino acids to rid the body of ammonia, a byproduct of protein metabolism. Citrulline also plays an important role in the healing process and in the maintenance of a healthy immune system.* Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens. This Extra Strength product has more L-Citrulline (1,200 mg per tablet) than our regular strength product (750 mg per capsule). Caution: For adults only. Consult physician if pregnant/nursing, taking medication (especially blood pressure medications and nitrates or other vasodilating drugs), or have a medical condition (especially abnormal blood pressure). Keep out of reach of children. Do Not Eat Freshness Packet. Keep in Bottle. Store in a cool, dry, dark place after opening. Please Recycle.