You actually could replace your entire protein intake with undenatured whey protein, and derive a benefit from it, assuming you were extremely ill and needed a lot of glutathione
Widely used in clinical, pharmaceutical, and research settings
One potentially relevant observation is that GHK-Cu exposure may increase intracellular copper uptake, which may conceivably support enzymatic activity involved in collagen processing

Key ingredients: Glutathione Vitamin C Grape seed extracts Vitamin E Alpha Lipoic Acid D Biotin How to use : Take 1 PharmEasy Glutathione tablet a day or as advised by your doctor Do not chew or crush the capsule but swallow it as a whole Take the tablet with a glass of water, after meals Take your doctors advice regarding the optimal dosage and duration Safety and precautions: Speak to your doctor before taking this product if you are pregnant, nursing or have other medical conditions Follow your doctors dosage recommendation and do not exceed the daily recommended dose Keep the bottle away from heat and direct sunlight, in a cool and dry place Do not consume it if the product has expired This product is not meant as a cure, treatment, prevention or substitution for any medicine Keep out of the reach of children FAQs Q1
For the most consistent results, take your capsule with only a glass of plain water and wait 30-60 minutes before having coffee or anything else