I have tried approximately 34059345 serums and never missed the loss of most of them, but once I finished my first bottle of this - WHOO BOY I FELT IT.
I use this a few times a week. Vit C formulas degrade really fast and I've had to throw out every single bottle of Vit C serum before they were finished, but not this one! Opened it in November and it's still doing just fine. Use ARABELLE15 for 15% off your order.