Slathering on heavy creams, thick oils, or a dense moisturizer probably sounds unappealing in the heat of summer. Of course, making topical swaps to lighter lotions and serums may work, but it might not cut it hydration-wise. So what can you do? Dermatologists and beauty experts recommend keeping your skin hydrated from the inside out and then top it off with a lighter lotion. An easy way to do this is through skin supplements, vitamins, and upping your daily water intake.