This vitamin C serum works well, but I personally didn't get results immediately. It takes time for hyperpigmentation to fade, so while the serum helped to speed this process, it still takes time. For those not used to using vit c, the serum might sting upon application. In contrast to the Klairs freshly juiced vit c serum, this one was a lot stickier, but I believe it's more effective because of the higher concentration of vit c.