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.

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 by-product of protein metabolism.* Citrulline also plays an important role in the healing process and in the maintenance of a healthy immune system.*

This extra strength product has more L-Citrulline (1,200 mg per tablet) than our regular strength product (750 mg per capsule).

Natural color variation may occur in this product.

Leucine is one of the three branched-chain amino acids (BCAAs) that is critical in muscle tissue structure.* Among the BCAAs, leucine is unique in its role as a signaling molecule that helps to regulate optimal skeletal muscle protein synthesis in normal tissues.* In addition, it helps to maintain already healthy glucose metabolism and insulin function, and may help to promote the use of fat for energy.* Studies suggest that leucine, in conjunction with adequate dietary protein, may help to build and maintain lean tissue and optimize body composition.* NOW^® Sports Leucine Powder is instantized for easy mixing in water, beverages or smoothies. No clumping.

L-Methionine is an essential amino acid, which means that it cannot be manufactured by the body and must be obtained through the diet or by supplementation. L-Methionine supports the production of the cellular radical scavenger glutathione, and thereby assists in natural detoxification processes.* In the body, L-Methionine can also be converted into SAMe (S-Adenosyl Methionine), a compound that supports healthy joints.* Furthermore, the human body relies on ingested sulfur amino acids, such as L-Methionine, for the synthesis of protein, as well as for biologically active sulfur.

Ornithine is a non-essential amino acid that plays a central role in the urea cycle, functioning along with arginine and citrulline to rid the body of ammonia, a by-product of protein metabolism.* Because ornithine is converted into arginine, it can help to maintain healthy arginine levels in the body.* Ornithine can also be converted into other amino acids, such as citrulline, proline, and glutamate, as well as creatine, an important muscular energy source.*

This product is pure, and because no anti-caking agents are used, lumping may occur. This product contains hydrochloride, the acid normally present in the stomach, which acts to stabilize the L-ornithine.

This product is sold by weight not volume.

Natural color variation may occur in this product.

L-Phenylalanine is an essential amino acid that is necessary for the synthesis of proteins.* Because L-Phenylalanine can be readily converted into the amino acid tyrosine, which forms part of the structure of the neurotransmittters dopamine and norepinephrine, it is important for the maintenance of a healthy nervous system.

L-Tryptophan is an essential amino acid; therefore, it is not synthesized by the body and must be obtained from the diet.* L-Tryptophan is critical for the production of serotonin and melatonin, which help to support a positive mood, healthy sleep patterns, and proper immune system function.* Every lot of NOW^® L-Tryptophan is tested to be free of Peak E and microbial contamination.

L-Tyrosine is a conditionally indispensable amino acid required for the production of the neurotransmitters dopamine, adrenaline, and noradrenaline, as well as for the skin pigment, melanin.* Noradrenaline (norepinephrine) and adrenaline (epinephrine) are the main actors in the body’s response to acute stress and, along with dopamine, help to support a positive mood and mental alertness.* In addition, L-Tyrosine is especially critical for the normal function of the thyroid gland.

Tyrosine is a conditionally indispensable amino acid required for the production of the neurotransmitters dopamine, adrenaline, and noradrenaline, as well as for the skin pigment, melanin.* Noradrenaline (norepinephrine) and adrenaline (epinephrine) are the main actors in the body’s response to acute stress and, along with dopamine, help to support a positive mood and mental alertness.* In addition, tyrosine is especially critical for the normal function of the thyroid gland.