Wondering how to properly layer, apply, and use skincare serums in your beauty routine? Here are a few serum application tips to help you get the best results: (1) Start your skincare with a serum. Generally, serums should be the first thing that touches your skin after cleansing to get the best results. Applying serums after moisturizer or oils can hinder absorption. (2) Don't pile on too many serums. There isn't a limit to how many serums you can layer on your skin, but beauty experts suggest limiting it to three. Using more products can potentially hinder each ingredient from getting absorbed into your skin. (3) Layer your serums in order of consistency. If you're using multiple serums, apply them from lightest to heaviest to boost absorption.