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.

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-Proline is an amino acid that is necessary for collagen production.* Collagen is the main structural protein that constitutes all human connective tissues, including skin, tendons, ligaments, joints, bone, and blood vessels (veins and arteries).* L-Proline is therefore a building block that helps to stabilize and strengthen the structural components of the body.* Although Proline is naturally produced in the body, in specific high-demand situations, a regular diet may not be sufficient to respond to the body’s need for Proline.

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.

Tryptophan is an essential amino acid; therefore, it is not synthesized by the body and must be obtained from the diet.* 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.

NOW^® Double Strength L-Tryptophan has twice the L-tryptophan (1000 mg per tablet) as in our regular strength product (500 mg per capsule).

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.

Tri-Amino is a comprehensive product that combines three important amino acids into one easy-to-take formula. Arginine and ornithine are essential components of the urea cycle.* This detoxifying cycle allows the body to convert ammonia, the toxic byproduct of amino acid breakdown, to urea.* Tri-Amino also has lysine, an essential amino acid known for its role in the maintenance of nitrogen balance.* Together these amino acids are critical for protein metabolism.

Norepinephrine and dopamine are key neurotransmitters for the maintenance of alertness and mental acuity and for promoting a feeling of general well-being.* These two neurotransmitters are produced in the body from the amino acid precursors L-tyrosine and L-phenylalanine.* This conversion process also requires vitamins C and B-6 as cofactors.* NOW^® True Focus™ combines these important nutrients with other ingredients like Ginkgo biloba and DMAE to complement this formula.