The requested item 00064 is obsolete and has been replaced. The new item is 24476.


500 mg 60 capsules: Twinlab, Item# 24476

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  • L-Cysteine
  • 500 mg 60 capsules: Twinlab
  • Item Catalog Number: 24476

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. Cysteine also helps synthesize glutathione, one of the body’s most important natural detoxifiers.

Supplement Facts

Serving Size 1 capsule

Servings Per Container 60

Amount Per Serving


500 mg

(from L-cysteine HCl)


Other ingredients: cellulose, gelatin, purified water, magnesium stearate, MCT, silica.

Dosage and Use

One capsule daily, or as directed by a healthcare professional.


When taking N-acetyl cysteine it is recommended that two to three times as much vitamin C be taken at the same time. Failure to do so may result in more harm than good from taking this product because of the prolonged presence of the oxidized L-cysteine.*