US$ 23.58
does beef liver have glutathione Nutrition Facts and Health Benefits Beef liver: Nutrition, benefits, and
Description
This is one of the best options for someone who travels a lot and wants to keep their glutathione supplementation consistent

doi: 10.1016/S0021-9258(18)47594-1

Adding NAC is also reasonable

However, the theoretical risk exists, and researchers with a history of pancreatitis or heavy alcohol use should exercise particular caution