Using face oil during the day can be intimidating — after all, no one wants their makeup to look greasy.  But for just a moment, we urge you to put your concerns aside because layering a hydrating oil under your foundation can actually provide a radiant, lit-from-within look that no single makeup product can match on its own. This beauty hack is especially useful if you have a dry complexion. To help you find the best face oil to use under foundation, we’re rounding up our favorite non-greasy options that will have your skin glowing in no time.