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There's a whole lot more to vitamin C than your morning glass of orange juice—the powerful ingredient is great for your skin, too. Inside the body, this potent vitamin keeps us healthy by boosting our immune systems and fighting off the cold that’s been going around the office. But when applied topically, it can be just as beneficial in keeping our skin clear, bright, and happy. With boast-worthy qualities like the ability to stimulate collagen production, brighten skin, and fight wrinkles, it’s no surprise that brands everywhere are opting to make vitamin C a core ingredient in their products.

But with so many vitamin C serums out on the market, how are you supposed to choose the best one? There are some key things to be aware of when choosing your skin’s new best friend. Vitamin C, like any other antioxidant, is notorious for destabilizing when it gets warm, so be sure to choose a product that’s housed in dark-colored glass packaging to keep it potent and protected from sun exposure. And, as Craig Kraffert, MD, board-certified dermatologist and president of Amarte, warns, vitamin C isn’t compatible with all ingredients, like those containing AHAs. “Vitamin C is very pH sensitive, and mixing it with AHAs tends to substantially diminish its delivery within the skin,” he explains. To make things a little easier, we’ve put together a comprehensive list of our picks to help get you started. Keep scrolling for our list of favorite vitamin C serums!

Up next, check out these perfect skincare pairings that will help you get the most out of your products.