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Marie Claire
Marie Claire
Lifestyle
Rebecca Fearn

NAC Is the New Skincare Ingredient Beauty Insiders Are Quietly Obsessed With

Yasmin Wijnaldum wears black sunglasses, burgundy bordeaux belted leather trench coat, outside Zimmermann, during the Paris Fashion week Women's Fall/Winter 2025-2026 on March 10, 2025 in Paris, France.

Scientific discoveries within skincare have come on leaps and bounds in the past decade. And while natural ingredients work for many, sometimes you just can't deny the science of emerging technologies and approaches. NAC is one such example; used for years within supplements, this antioxidant-boosting compound is now being found within topical skincare—perhaps most notably at doctor-founded brand, 111Skin.

Its increasing popularity is hard to deny; within the cosmetic, healthcare, and food industries, the NAC market is is projected to reach USD 13.5 billion by 2033, marking huge growth. "NAC has strong scientific credibility and multifunctional benefits that appeal to consumers who increasingly favour evidence-based, clinical-grade actives," says Dr Yannis Alexandrides, who created the luxury line, 111Skin.

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