A skincare expert has revealed the beauty ingredients you should never mix together — and divulged why it could wreck your skin if used simultaneously.Manuela Marcheggiani, from , is the co-founder and CEO of , a brand that prides themselves on putting science first.She suffered from 'severe' sensitive skin during her childhood and teen years, and began to take matters into her own hands while in college, creating her own formulas with co-founder Darius, later turning it into a full-fledged brand.
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