By Jolene Edgar Skin-Care Product Boosters Stop thinking of performance enhancers as athletes’ dirty secret. These products claim to amp up your existing regimen. We asked dermatologist Jeannette Graf to evaluate. DDF AMPLIFYING ELIXIR The claims: Strengthens the skin‘s moisture barrier by up to 70 percent to boost the hydration results of your skin-care regimen The road test: The thin liquid spread easily and felt weightless. The dermatologist’s verdict:“It uses niacinamide to reinforce the skin’s moisture barrier, which is made up of humectants […]

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