Phyto-C's vitamin C serums meet the three most crucial criteria for an effective vitamin C serum. Each formula contains pure L-ascorbic acid (the most bioavailable form of vitamin C) in an aqueous (water) base, ensuring optimal penetration into the skin. The serums are formulated with a pH below 3.5, which facilitates the protonation of vitamin C, further enhancing its absorption. Mor... https://www.phyto-c.com/blogs/news/the-deceptive-truth-of-stable-vitamin-c-derivatives