This is the best vitamin C product I've ever used! If you're not a fan of sticky, heavy vitamin C products, you will love this. I don't think I've ever used such a watery serum before! As you can see in the reel, it is more or less the consistency of water and absorbs completely, which is a huge plus for me. I found this serum to be very gentle and I've experienced no irritation at all, even after using morning and night on a daily basis. I've been testing this serum out on some stubborn hyperpigmentation and have been seeing very promising results!