I just wanted to say the Zinc C Serum is absolutely amazing. I have been using it for about two months now and the results I have seen are less redness, less irritation, a more even tone, and most importantly less breakouts! I am an esthetician and have access to many products, but this is a staple in my routine. It addresses all the concerns I have - redness, breakouts and hyperpigmentation in a simple, natural formula without preservatives.