N-acetyl cysteine is acts as an antioxidant by in addition NAC is a cysteine precursor to the antioxidant, glutathione. As part of the cellular antioxidant defense system, glutathione plays a key role in cellular detoxification by neutralizing. If you are pregnant, nursing, or taking medication, have a medical condition or planning surgery, consult a doctor before using this product. Stop using and consult a doctor if any adverse reactions occur. Do not accept if seal is broken. Store in a dry place between 59°-86°F. Keep out of the reach of children. VitaminsPro is NOT responsible for any and all packages detained/impounded/or returned to us by the country’s respective Customs Department. It is the FULL responsibility of the customer to ensure that thes.