N-Acetyl Cysteine (formerly Bio-Cysteine) provides cysteine which is a sulphur amino acid. N-Acetyl Cysteine contains 500mg N-acetyl cysteine per capsule. Provides sulphur containing amino acid N-acetyl cysteine.Directions:One capsule taken three times daily before food or as professionally directed.NB: Bio-Cysteine has a strong sulphur like smell which is completely normalIngredients:N-Acetyl Cysteine, Capsule Shell (Hydroxypropyl Methylcellulose), Anti-Caking Agents (Silicon Dioxide & Magnesium Stearate).