Glutathione Active reduced form Life Extension Europe 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 for Skin: IV vs. Oral Which Works Better? Before you spend money on glutathione, read this first. Topical, oral, injectable what actually works and what's just marketing? #funskincare #funingredientsinfographic101