Both Boosters are filled with potent antioxidants. The difference is the ingredients: vitamin C is clinically proven effective in skincare, so it’s widely loved and used. The Antioxidant Booster is a more recent innovation in skincare, as studies have shown its hero ingredient, apple peel powder, to be an even more potent antioxidant. We recommend it for those with ultra sensitive skin and breakout-prone skin, as it’s less acidic. Many customers choose to alternate them to get as many antioxidants to their skin as possible.