A good vitamin C serum should be a part of your everyday skincare routine. But are you applying it at the right step in your skincare routine? If you use a vitamin C serum with an oil-like consistency or one that is more liquid-based than cream-based, you will want to apply it earlier on in your routine. Generally speaking, beauty experts suggest going from thinner consistency serums and then moving to heavier serums on top. Vitamin C serums come in many different consistencies, so read the formula’s packaging instructions to find out where to insert your vitamin C serum.