Including specific serums for dry, oily, and acne-prone skin.
Of all the vitamin-C options, our experts generally recommend looking for serums that contain ascorbic acid, also known as L-ascorbic acid, which is the most active and purest form of vitamin C. L-ascorbic acid is water soluble. While incredibly effective, it can be irritating for some people and even cause acne.
In recent years, products have come out containing both L-ascorbic and an accompanying derivative, which combines the unstable formulation with a more stable formulation — offering the best of both worlds.All of our experts agree: Formulation is paramount to vitamin C’s stability. The more stable, the better, because you reap all of the glow-inducing benefits. “A product must be formulated carefully to enable sufficient delivery to the skin,” Dr. Kenneth Howe of theexplains.
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