NOW Glutathione is primarily a liver-support and detoxification supplement. Glutathione is needed to make an enzyme know as glutathione peroxidase which is involved in removing many different kinds of toxic compounds, but there are limits to how much glutathione the body can manufacture in a given period of time. So people interested in detoxification and liver support have an interest in doing whatever they can to support glutathione status. Taking a glutathione supplement like this one from NOW Foods provides all the building blocks for new glutathione production and works well along with milk thistle, alpha lipoic acid and other liver-support nutrients.