NAC is an amino acid that naturally stimulates glutathione, an antioxidant enzyme. People who have autoimmune problems are often deficient in glutathione. NAC has been used to raise immunity to the flu, and also to treat chronic respiratory problems. A recent study was conducted in which most of the subjects were over 65. Results showed that only 29 percent of those taking NAC developed flu symptoms, compared to 51 percent of those who took the placebo.
Dosage: 300 mg. per day.
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