The 500mg per tablet is only guaranteed to contain 15mg. But this is true of almost all amazon reviewers. Guaranteed potency was only for 15mg - no, that is not a typo.

A little capsule once a day seems to give the immune system an extra boost. Great supplement to clean your liver, and get the mucus out of your lungs. Nac helps to heal leaky gut, and i felt measurable improvement.

When you open the bottle it smells like sulfur. Product recommended by a crnp.