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It is difficult to find enough superlatives to do justice to our serums. These boosters can be used under a mask to intensify its effect. They can also be applied sparingly to a cleansed skin and followed with your moisturizer of choice. All we can say is: try one! Use Plumping Serum for smoothing fine lines, and Renewal Serum would be the choice for skin that has become somewhat dry. Radiance Serum is particularly useful for darker skins, or where there is hyper-pigmentation.