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Face serums are formulations that include a high concentration of a certain active ingredient. That active component might differ based on whatever serum you're using and why! Serums differ from moisturizers and exfoliate in that they target a single skin condition rather than include a variety of components. However, here's a suggestion to ensure that whichever face serum you use shows results: always use sunscreen. Serums include actives, which can degrade if exposed to too much sunlight. Make the most of your face serums by keeping them under a good moisturizer and a sunblock.