Despite its efficacy, vitamin C is notoriously unstable and can quickly go from a hyperpigmentation-zapping wonder ingredient to a $60 bottle of smelly serum. That’s why it’s important to find ...

For these kids, she would suggest either a multivitamin or a selection of supplements, such as vitamin D, Omega-3 fatty acids, or vitamin C. “Liquid vitamin D is necessary for breastfed infants ...

Many of the creams on this list contain multiple key moisturizing ingredients (our top pick contains seven!), which we’ve noted — along with any additional skin-care benefits like vitamin C (a ...