Pure Difference: All Pure Encapsulations products are FREE FROM wheat, eggs, tree nuts, peanuts, gluten, artificial colours, flavours, sweeteners, coatings and shellacs, GMOs, unnecessary binders, fillers and preservatives. Pure Quality: Our NAC capsules are made with only premium ingredients sourced from trusted suppliers and guided by our nutritional experts, then carefully manufactured and tested to verify their potency and purity. 30 - 90 Days of Supply: The recommended dosage of this NAC supplement is 1 capsule, 1–3 times daily, between meals, or as directed by a healthcare professional. Health Support: Intake of NAC in this highly bioavailable form contributes to a wide range of health functions. Active Ingredients: Provides free-form NAC (n-acetyl-l-cysteine). NAC is a sulphur containing amino acid involved in glutathione synthesis.