I have been using Malibu C Zinc C Serum for two months now. Since I started using it I have noticed major changes to my skin. My skin is no longer irritated anymore, and it has a more youthful and less tired appearance. This is a highly effective product for people with sensitive skin that would like to look more youthful. It is a great value for the benefits I get from it and it's an affordable price. I would highly recommend this product to anyone, I love it!