Vitamin C serums offer a multitude of benefits when incorporated into both your morning and evening skincare routine. Using a vitamin C serum as part of your morning skincare routine means that your skin is better able to neutralise harmful free radicals. These can build up throughout the day and tear down much-needed skin collagen. On the other hand, when using vitamin C serums as part of your evening routine, you can avoid the risk of dangerous photosensitivity. This is because vitamin C can make skin more sensitive to sunlight.