5 IN 1 Facial Serum 30ml | Hyaluronic Acid Niacinamide Vitamin C Vitamin E Collagen Even Skin Tone Anti-Wrinkle Face SerumOverview I was honestly skeptical about multi ingredient serums ? usually when something tries to do everything it ends up doing nothing particularly well. But I've been using this 5 in 1 for about 6 weeks now and the combination of 10% hyaluronic acid, 5% niacinamide, 30% vitamin C, 10% vitamin E, and 5% collagen in one dropper is actually working for my skin. The vitamin C concentration is notably high at 30% which means you'll want to patch test