Beauty Skincare Face Moisturizers and Serums Julianne Moore’s Smooth Complexion Is Thanks to This Luxe Vitamin C Serum From an InStyle-Favorite Brand Hailey Bieber has used it, too. By Tamim Alnuweiri Tamim Alnuweiri Instagram Twitter Website Tamim is beauty commerce writer at InStyle, with nearly a decade of experience writing about beauty, fashion, wellness, and music. InStyle's editorial guidelines Published on January 20, 2023 @ 12:00AM Pin Share Tweet Email We independently research, test, review, and recommend the best products—learn more about our process. If you buy something through our links, we may earn a commission. Photo: Getty Images I never thought about the Venn diagram between Julianne Moore and Hailey Bieber but when I did, I assumed these were two circles with no overlap. I was wrong, however: There is a shared sliver of commonality between the two, and it’s skincare brand Is Clinical. One of the 20 products Moore mentions in her recent Vogue Beauty Secrets video is Is Clinical’s Pro-Heal vitamin C serum. In 2019 — so granted, a few years ago — celebrity facialist Melanie Grant mentioned that it was one of the products Bieber used in her routine. A product that fits in the routine of a woman in her early 20s and a woman in her 60s is surprising, so what exactly makes this serum a universal buy? Amazon Shop now: $81–$95 (Originally $95); amazon.com and skincareessentials.com What you get, according to the brand, is a complementary combination that offers quite a few benefits. First, there’s antioxidant protection from the three vitamins C, A, and E. Vitamin C also specifically helps reduce sun damage while firming skin. The moisturizing, soothing, and healing properties of this serum come from olive leaf and vitamin E. The result is healthier skin with less inflammation (aka redness and soreness), fewer blemishes, less visible wrinkles, and lightened dark spots and hyperpigmentation. As evidenced by Julianne Moore, you don’t need much, which is great since it’s admittedly pricey (though it’s currently nearly 15 percent off at Skincare Essentials.) In the video, the actress says she uses “four to five drops” and is then seen patting it into her skin. One of the Pro-Heal Serum’s five-star reviewers wrote that because of the price tag they “hate to love it,” but that end result is “worth it” since their skin is finally “smooth and glowing” enough that they can skip foundation. The brand is not only in the vanities of celebrities, but it’s a favorite among InStyle testers who say it’s the best serum for acne in addition to being named one of the best luxury brands of this year. Shop the $95 Is Clinicals Pro-Heal Serum at Amazon, or head to Skincare Essentials to nab it for $81. Shop More InStyle-Approved Picks These New Shearling Mini Boots Are Half the Price of Competitors, and They’re Selling Like Hotcakes Get Designer Clothes From Kate Spade and Tory Burch for Less Than $130 With This Secret Amazon Style Hack Shoppers Say Amazon’s Best-Selling Sweater Is “So Soft on Skin” — and It’s More Than Half Off Right Now