Ingredient directory

An amino acid found naturally in green tea that promotes a calm, focused state without sedation.

Typical: 100–200 mg

A sulfur-containing amino acid abundant in muscle, heart, and brain, and a familiar ingredient in energy drinks and pre-workouts.

Typical: 1–3 g

The most abundant free amino acid in blood and muscle and a primary fuel for intestinal and immune cells.

Typical: 5–10 g

The simplest amino acid and a major building block of collagen, glutathione, and creatine.

Typical: 3–5 g

A conditionally essential amino acid that serves as the direct precursor to dopamine, norepinephrine, and epinephrine.

Typical: 500–2,000 mg

An acetylated form of the amino acid cysteine that is the rate-limiting precursor for glutathione, the body's principal intracellular antioxidant.

Typical: 600–1,800 mg

An acetylated form of carnitine that crosses the blood-brain barrier more readily than carnitine itself and donates acetyl groups for acetylcholine synthesis.

Typical: 500–2,000 mg

A stable, highly soluble salt of L-carnitine with tartaric acid, the form most used in exercise-recovery research.

Typical: 1,000–2,000 mg

The immediate precursor to serotonin, extracted commercially from Griffonia simplicifolia seeds.

Typical: 50–300 mg

The brain's main inhibitory neurotransmitter, sold as a supplement for relaxation and sleep.

Typical: 100–500 mg

An essential amino acid and the dietary precursor to serotonin and melatonin.

Typical: 500–2,000 mg

An essential amino acid that is limiting in grain-based diets and is needed for collagen cross-linking, carnitine synthesis, and calcium handling.

Typical: 1,000–3,000 mg

A conditionally essential amino acid and the direct substrate for nitric-oxide synthase.

Typical: 3–6 g

The branched-chain amino acid that most directly triggers muscle protein synthesis through mTOR signaling.

Typical: 2.5–5 g

An acetylated form of tyrosine marketed for better water solubility than plain L-tyrosine, which makes it convenient in ready-to-drink and powder formulas.

Typical: 350–1,000 mg

A non-protein amino acid central to the urea cycle, where it helps clear ammonia produced during exercise and protein metabolism.

Typical: 400–2,000 mg

A metabolite of arginine that acts as a neuromodulator, binding imidazoline and NMDA receptors and influencing nitric-oxide synthase.

Typical: 500–1,500 mg

An essential sulfur-containing amino acid that starts every protein chain and is the precursor to S-adenosylmethionine, the body's main methyl donor, as well as cysteine and glutathione.

Typical: 500–1,000 mg