Best Time to Take Glutathione: Morning or Night? Healeo Nutrition Amazon.com: S Acetyl L Glutathione Capsules 100mg, 60 Count (Acetylated Glutathione Antioxidant More Absorbable Than Glutathione and Liposomal Glutathione, Non GMO and Gluten Free) by Double Wood : Everything Else How long does glutathione injection take to whiten skin? 1 to 2 skin whitening injection can be injected in a week, so the complete treatment may take up to 3 months. As How Long Does Glutathione Take to Work & Show Results? Performance Lab