Hyaloronic Acid plumps up the skin making it look younger. It's found naturally in the skin, but adding an extra dose of moisture via this serum does double duty. Unlike other "acids", this doesn't strip skin at all, so it is safe to use as often as you would like. Use it either in the AM or PM—but it should be the first thing you do, so before sunscreen and/or a moisturizer.
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