Drum roll, please...
, a gram of HA can hold up to six liters of water.) “It’s very good at hydrating because it can bind so much water,” Dr. Newsom says.
“When it's applied topically and it gets absorbed into the skin, it allows additional hydration by attracting water,” Jenny Hu, M.D., associate professor of dermatology , Keck School of Medicine of USC, tells SELF. In doing so, it can both hydrate and plump the skin, making it feel moisturized and softening the look of fine lines, wrinkles, and sagging—often without any added greasiness.Hyaluronic acid was first isolated back in the 1930s, so we’ve had decades to study and understand it.
What we do have are studies examining the use of hyaluronic acid alongside other ingredients to either help soothe some side effects or more effectively deliver the drug. For instance, in a 2009researchers gave 34 participants taking oral isotretinoin a gel-cream containing hyaluronic acid and 33 participants a placebo cream.
But the truth is that we're lacking independent, large-scale clinical trials examining the cosmetic potentials of hyaluronic acid. As put it last year, hyaluronic acid cosmetics claim to "restore skin hydration and elasticity, although no rigorous scientific proof is able to fully substantiate this claim."
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