There are over 1,000 reviews for this Drunk Elephant B-Hydra Intensive Hydration Serum ($52), a moisturising vitamin B5 serum that can also improve skin's texture and tone with its pineapple ceramide. It's good for skin that's dehydrated — perhaps due to dropping temps — as it offers a watermelon rind, apple, and lentil complex that improves water retention, and can even reduce the appearance of fine lines. It's best added to another moisturising cream, or even another serum like vitamin C, as they can work together for a doubly strong hydration boost.