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.

Cysteine is a non-essential sulfur amino acid, which plays a critical role in methionine, taurine and glutathione metabolism.* It is also an important component of hair, nails and the keratin of the skin. Cysteine stabilizes protein structure and aids in the formation of collagen, being thereby indispensable to skin, hair and nail health.

L-Histidine is an essential amino acid that is best known for its role in the production of histamine, an important mediator of immune system responses.* Histidine is also critical for normal brain function, as well as for the maintenance of a healthy skin barrier.* In addition, histidine plays important roles in muscle function, cardiovascular health, protection against free radicals, and the elimination of heavy metals from the body.

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.

Lysine is an essential amino acid that must be obtained through the diet or through supplementation. Lysine is necessary for the production of all proteins in the body, and is required for the maintenance of the structural proteins collagen and elastin, which form all connective tissue such as skin, tendon, and bone.* Lysine is also a precursor to carnitine, which is needed for fat metabolism and energy production.* In addition, lysine may help to support a healthy immune system and proper cardiovascular function.*

Natural color variation may occur in this product.

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 byproduct 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.

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.

Serine is a non-essential amino acid that is necessary for the production of phosphatidyl serine, an important component of brain cell membranes.* Serine is also involved in muscle formation, maintenance of immune system function, and brain health.* It is also essential for the maintenance and growth of healthy neurons.

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.*

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.