IV or Oral Glutathione Which Works Better? At LaserTreat, we get this question all the time! Here's the truth IV Glutathione delivers 90100% absorption, while oral supplements Glutathione as a skin whitening agent: Facts, myths, evidence and controversies Indian Journal of Dermatology, Venereology and Leprology Systematic Review of the Efficacy and Safety of Topical Glutathione in Dermatology JCAD The Journal of Clinical and Aesthetic Dermatology Oral supplementation with liposomal glutathione elevates body stores of glutathione and markers of immune function European Journal of Clinical Nutrition Glutathione depleting drugs, antioxidants and intestinal calcium absorption