S Acetyl L Glutathione Powder Nootropics Depot How Long Does Glutathione Take to Work & Show Results? Performance Lab Amazon.com: Allergy Research Group ARG Acetyl Glutathione 100 mg Stabilized Bioavailable Glutathione Antioxidant & Immune System Support Well Absorbed Formula 60 Servings 60 Tablets : Health & Household 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 Glutathione IV Therapy: Timeline for Skin Lightening