Lamberts N-Acetyl Cysteine (NAC) is a one to two-a-day formula that provides 300mg of NAC per capsule. Made in the UK and produced in premises that operate to stringent pharmaceutical standards of GMP. It is suitable for vegetarians. NAC is an altered form of the amino acid L-Cysteine and is one of the few amino acids to contain sulphur. As a consequence, NAC has strong sulphur like odour, which is completely normal. NAC increases the amount of a substance called glutathione in the body and is widely recommended by practitioners.