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We Asked Kim Kardashian’s Aesthetician to Name the One Skin-Care Ingredient Everyone Over 40 Should Be Using (www.newbeauty.com)

Celebrities have access to the best skin-care products and experts, so it’s no wonder why every red carpet is lined with flawless complexions. But what products actually make a difference in the skin and are worth the investment? We asked aesthetician to the stars Candice Miele—her clients include Kim Kardashian and Vanessa Lachey—for the number-one ingredient she recommends everyone over 40 use on their skin, and to our surprise, it wasn’t retinol. 

“You really want to be using something with a lot of peptides,” says Miele. “Peptides are really anti-aging and really work to keep things plump,” says the expert. By working deep in the cells to plump skin from within, peptides eventually firm the skin by promoting the formation of collagen and elastin. 

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What are Peptides? What to Know About the Collagen-Boosting Ingredient (www.newbeauty.com)