Glutathione IV Therapy: Timeline for Skin Lightening 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 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 Our SAG plus 300 supplement is an oral method to increase glutathione levels in the body and protect our cells from damage1. The innovative formulation contains a premium high dosage S acetyl glutathione Glutathione Injection: Benefits, After Care & Side Effects DripGym S Acetyl L Glutathione, 100 mg, 120 Veggie Capsules