L-cysteine is a conditionally essential amino acid, one of only three sulfur-containing amino acids, the others being taurine (which can be produced from L-cysteine) and L-methionine (from which L-cysteine can be produced in the body by a multi-step process). Cysteine plays a role in the sulfation cycle, acting as a sulfur donor in phase II detoxification and as a methyl donor in the conversion of homocysteine to methionine.136-138 Cysteine also helps synthesize glutathione, the body’s most important intracellular antioxidant and a vital detoxifier.139-142
N-acetyl-L-cysteine (NAC) is the acetylated form of L-cysteine that has been used to break up pulmonary and bronchial mucous.143-146 It is very efficiently absorbed and has been shown to protect cells directly and support the immune system.146-155 NAC is an antioxidant and a free radical-scavenging agent that increases intracellular glutathione at the cellular level. NAC can act as a precursor for glutathione synthesis as well as a stimulator of the cytosolic enzymes involved in glutathione regeneration.146 NAC has been shown to protect against oxidative stress-induced neuronal death in cultured granule neurons.156
References available upon request.
Servings Per Container: 60
Take one (1) capsule one to three times daily with or without food, or as recommended by a healthcare practitioner.
Serving Size: 1 vegetarian capsule
Amount Per Serving
N-acetyl-L-cysteine … 600mg
Other ingredients: vegetable cellulose (capsule), vegetable stearate, silica.
Those who supplement with NAC should drink 6 to 8 glasses of water daily in order to prevent cysteine renal stones. Cysteine renal stones are rare but do occur.
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These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.
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