I’ve been a loyal Paula’s Choice customer for several years, and this serum is one of their best products. It’s definitely my favorite vitamin C product I’ve used, and I’ve tried a number of them. I use this every morning, and it has made such a difference in making my skin glow. I use it liberally because it doesn’t last too long, which is normal for vitamin C products. I keep it in the fridge, and that helps it last a little longer. Overall, this is definitely worth the price and I will continue to buy.