This is a high potency serum that's formulated with a proprietary 5-source vitamin C complex to help brighten, boost collagen, and minimize the appearance of fine lines and wrinkles. It's enriched with green tea extract and sodium hyaluronate and is oil free, as well as paraben, sulfate, and phthalate free. It has a light, citrus-y scent and is light orange in color. I've been using this daily for about 2 weeks, and while I have noticed some subtle brightening, I don't quite think I would pay almost $50 for the full sized bottle. Another thing that turns me off is the fact that this serum is orange; most vitamin C serums turn orange when oxidized, and the fact that they made the serum orange could easily hide oxidation, so I would have no idea when the product is no longer effective. A small design flaw, but admittedly a deal breaker for me. I really like the serum, but I need to be able to tell when my vitamin C serum has kicked the bucket.