Glamour.com

Designed to take your usual serum up a notch, these single-dose boosters (which, FYI, can be recycled via Terracycle) pack 20% vitamin C, as well as botanicals that are naturally rich in the stuff too. (If that sounds intense, no sweat—they also include anti-inflammatory ingredients designed to blunt any side effects.) It’s intended to be a four-week boot camp for skin, making it ideal for after summer or whenever your skin needs a quick yet powerful pick-me-up.