L-Leucine
The most anabolic of all amino acids, L-Leucine directly activates the mTOR signaling pathway — the master switch for muscle protein synthesis. Studies show it reduces muscle breakdown and stimulates new muscle tissue growth, making it essential for anyone over 40 experiencing age-related muscle loss (sarcopenia).
L-Valine
A branched-chain amino acid (BCAA) that works alongside leucine and isoleucine to supply fuel directly to muscle tissue during exercise. L-Valine supports glycogen synthesis in muscles, improving endurance and reducing exercise-induced fatigue at the cellular level.
L-Isoleucine
Works synergistically with leucine to regulate blood sugar and promote muscle uptake of glucose during exercise. L-Isoleucine plays a key role in hemoglobin production and supports the immune system during periods of intense physical stress.
L-Lysine HCl
Critical for collagen and connective tissue formation, L-Lysine helps repair micro-tears in muscles and tendons after training. It also improves calcium absorption, supports immune function, and plays a role in carnitine synthesis — a compound that converts fatty acids into energy.
L-Phenylalanine
A precursor to key neurotransmitters including dopamine, epinephrine, and norepinephrine, L-Phenylalanine supports mental alertness, mood, and pain tolerance during intense training. It also plays a role in the production of melanin and thyroid hormones.
L-Threonine
Essential for the production of glycine and serine, L-Threonine supports collagen formation, gut lining integrity, and immune function. It also plays a role in fat metabolism in the liver, helping prevent fatty liver accumulation in people on high-protein diets.
L-Methionine
One of only two sulfur-containing essential amino acids, L-Methionine is a precursor to cysteine, taurine, and glutathione — the body's most powerful antioxidant. It supports liver detoxification, cartilage formation, and protects muscle cells from oxidative damage during exercise.
L-Tryptophan
Best known as the precursor to serotonin and melatonin, L-Tryptophan supports sleep quality, mood regulation, and recovery. Deep sleep is when growth hormone is released — making this amino acid indirectly critical for muscle repair and long-term muscle building.
