for Mad Hippie’s Vitamin C Serum. I’ve written about this brand before. I’m happy to report the Vitamin C Serum lives up to the hype. It is often on the list of “best of’s” for vitamin C. This serum uses Ferullic Acid like another popular, but much more expensive product. The Vitamin C in it is Sodium Ascorbyl Phosphate. So get Mad with Vitamin C, and get happy with the results….