The 411 on retinol—the wonder ingredient skin-care buffs are obsessed with

Considering all the misconceptions around retinol, we tapped Rachel Nazarian, MD, dermatologist at Schweiger Dermatology Group in NYC to fill us in on the real deal—and beauty blogger Cynthia Ess to give Algenist's Advanced Retinol Serum a test drive.

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algenist vegan retinol serum