Vitamin C is important for tissue growth and repair and may play a role in immunity, too. It’s extra-important for pregnant women as it enhances the absorption of iron. “Vitamin C also supports the adrenal glands that can become taxed during pregnancy,” says Dean. The RDA for pregnant women is 80 to 85 mg; take any more of this water-soluble vitamin and you’ll just pee it out. Get plenty of C in your diet through foods like tomatoes, oranges, red bell peppers, strawberries and papaya.