HealthWise L-Arginine HCL is 100% pure pharmaceutical grade amino acid. L-Arginine has numerous functions in the body and is considered a semi-essential amino acid as the body cannot always manufacture enough for daily requirements. HealthWise L-Arginine uses pure arginine hydrochloride as it is freely soluble in water and well absorbed. 100% pure powder Pharmaceutical grade Packed without fillers or flowing agents Vegan friendly Gluten free Dairy free L-Arginine is generally well absorbed orally and can be added to foods or liquids. Studies have shown an average adult serving would be between 2 and 20g depending on diet and other contributing factors.