This is the best vitamin product. Considering the effectiveness and cost-effectiveness, it's the best. It's especially great for red acne. I stopped using it for a while because I bought other serums and lotions that contain vitamins. For a while after I stopped using it, nothing changed. But after 2-3 months, I started getting red pimples. They pusted and became painful, and even after the pimples healed, they left behind blemishes. Before they healed, more red pimples would appear, creating a vicious cycle. I wondered why I hadn't had any before, so I researched various acne treatments and tried various things, but nothing changed. I didn't know what was wrong, but I thought maybe switching back to what I was using before might help. The first thing I reached for was a little Melano CC vitamin serum I had left over. The result: My red acne cleared up quickly and instantly. I had very little left, so I quickly bought more. It's reasonably priced, contains a lot of ingredients, and has a premium feel, but it's still incredibly effective. I really recommend it.