If you’re searching for an improved complexion or major glow up, look no further than vitamin C. It’s the powerhouse anti-aging ingredient that brightens, firms, and smoothes skin (and may even prevent and treat UV damage). Improve your skincare routine by opting for a brightening serum—it’s the most potent form of vitamin C, plus it provides you with the biggest bang for your buck. Shop some of the best vitamin C serums below, and look forward to brighter skin over time.