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How to Use Vitamin C Serum at Night
There's some evidence that if you use a vitamin C serum, immediately before a retinal, it will increase absorption of the retinal. That can be a good or bad thing depending on how sensitive your skin is. If you're super duper sensitive, increasing retinal absorption might make you a bit irritated. Using a vitamin CBE ferulic serum followed by a retinal can actually be really extra powerful and give you an extra boost in improvement of hyperpigmentation and fine lines.