NOW Supplements L-Citrulline 750 mg - 90 Veg Capsules

Healthy Immune System Function 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. Natural color variation may occur in this product.