BulkSupplements.com Pure Bulk Supplements, Vitamins and Minerals Today we are asking Mike: Whats NAC?, NAC is converted into l cysteine when its consumed in the body, which is then converted into glutathione, a powerful antioxidant that supports liver health and L glutamine doesn't get nearly the same love that other supplements like NAD+ and collagen do, but we think it's just as important. For a full L glutamine breakdown, head to The Wellness Edit 15 Glutathione Benefits: How to Improve Your Mind & Body