Sometimes sticky during application. Stickiness goes away tho. For the price and quantity & quality, it's great. I use it together with The Ordinary's Niacinamide + Zinc (which works excellently for sebum control). I've only used this for a few days. But so far, no negative reactions. My main thing isn't brightening; it's for antioxidants. I have oily, acne prone, sensitive skin.
This is my all time favorite vit C. Good recommend for evening use.