One of the most popular private label skincare products on the market is the vitamin C serum. There are literally hundreds of variations on this one product alone, with brands competing with each other and customers trying their best to find their favorite. But the days of vitamin C reigning unchallenged are over. There's a new product in line, and it promises to be as big of a deal as ever. It's the active botanical oil serum; the flowery smelling, oil based competitor of our time.