You might have taken this B vitamin after you chopped your hair into that regrettable pixie cut, as biotin is known for promoting stronger hair. But biotin can also be extremely beneficial for your skin thanks to its role in regulating fatty acid metabolism. Fatty acids help regulate new skin cells from external damage and dehydration. If your body lacks biotin, your skin cells will show that their defenses are down. (Think: cracks on the sides of the mouth, overall itchiness and scaly skin.) Having a true biotin deficiency is uncommon, but working extra biotin into your diet can help moisturize parched skin when the weather outside is frightful. In supplement form, 30 to 100 micrograms daily is sufficient.

Find it in: egg yolks, liver, avocados, oats, Swiss chard, romaine lettuce, almonds, walnuts, chicken, beans, legumes, carrots

You may gravitate toward vitamin C during wintertime in attempt to ward off sniffles, but research says that you should be stocking up on foods rich in this antioxidant for healthy, radiant skin. Like vitamin E, vitamin C is an antioxidant that protects cells by neutralizing free radicals and reduces inflammation that is triggered by cold weather. Vitamin C also increases collagen production, the protein that gives skin its firmness and elasticity. Young skin is naturally full of vitamin C, but you slowly lose the nutrient over time. When collagen breaks down and vitamin C isn't there to replenish it, wrinkles begin to form. Upping your intake in vitamin C (the recommended oral dosage is 75 to 120 milligrams daily) can encourage collagen production and strengthen your skin's natural barrier so you retain more moisture during winter months.

Find it in: oranges, grapefruits, lemons, limes, cauliflower, spinach, broccoli, bell peppers, kiwis, red cabbage, snow peas, strawberries, tomatoes, kale