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“Everyone’s always talking about retinol because it helps with acne, hyperpigmentation, skin texture, skin tone and even wrinkles,” says mega influencer Dermdoctor in a TikTok to his 18.1 million followers. Retinol — a form of vitamin A used in skin products — has become one of the beauty industry’s biggest buzzword ingredients thanks to its proven effectiveness. But as its use has spread like wildfire, it has sparked safety concerns — and regulators have stepped in.