Scientists studying microalgae for use in biofuels discovered that alguronic acid might protect skin from environmental damage. Though no clinical research on the efficacy of Sephora's Algenist products has been published in peer-reviewed journals, dermatologists say the in vitro test results are interesting. "In the petri dish, their data seems to show some substantial benefits to their active ingredient," dermatologist Dr. David McDaniel said. But he and other dermatologists cautioned that lab results don't necessarily translate to the final product.

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