@estycarolyn: Vitamin C can be a tricky ingredient to formulate. Lots of products on the market don’t live up to their claims because the vitamin C degrades before it reaches the parts of your skin it needs to. That’s why I love the oil soluble form of vitamin C THD!! Revision has one of the highest % of this ingredient and works for sensitive skin. @revisionskincare #revisionskincare #bestvitamincserum #licensedesthetician #licensedmedicalaesthetician