While some foods like spinach, avocados, and asparagus contain glutathione, the body does not absorb it very efficiently from food sources
Under DSHEA, manufacturers can sell glutathione capsules, tablets, or powders without submitting safety data to the FDA as long as the product contains ingredients with a documented history of safe use prior to 1994 or meets the New Dietary Ingredient (NDI) notification process
The convenience factor is significant for patients uncomfortable with manual injection preparation
For example, salmon store astaxanthin obtained from their food and pass on to its roe (ikura) which it protects against from sunlight damage in the river
[DOI] [PubMed] [Google Scholar] Younossi ZM, Kalligeros M, Henry L