Vitamin D is often called the "sunshine vitamin," mostly because we can get it naturally when the sun's UV rays interact with our skin, which triggers the vitamin's synthesis. The VIP vitamin aids our body's absorption of calcium to keep our bones strong and encourage healthy cells to grow. Here are a few more health benefits of this versatile vitamin, according to healthline.com: 1. Fighting Depression Studies have found that people with depression are often deficient in vitamin D and that depression gets better after taking a vitamin D supplement. Researchers find some wiggle room in the fight against Alzheimer's disease. Find out more.