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Vitamin D is one of the most important hormones in your body because it has such far-reaching effects in different organ systems. It regulates calcium and phosphorous absorption, which is very important for bone health. It also has effects on your immune system function Ð so when your levels get low in the winter, you get sick more often. Finally Ð it has effects as a pre-hormone to your sex steroids, which include testosterone, estrogen, and progesterone. So if you’re low on Vitamin D and you optimize it by supplementation or getting more sun exposure, you can actually improve the health of your hormones.