How Long Do Glutathione Injections Take to Work? Clear Timeline, Ideal Dosage & Fast Track Results E How Long Does It Take for Glutathione to Work? How Much Glutathione Should I Take for Skin Whitening? The Dark Truth About Glutathione & Skin Whitening Risks, Myths & Facts Oral glutathione has been everyone on my timeline but does it actually work?! Looking at the data, its very modest to be honest. Id recommend sticking to what we know works fo hyperpigmentation in