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Certainly, it's best to get your Vitamin D from the sun. It's the most natural approach. However, there are other ways if needed. Here's a guide to those sources, and how to convert IUs to milligrams
While it's best to obtain your Vitamin D3 by sun exposure, nowadays it simply isn't practical for most of us to spend that much time outside. There's no need to worry, though. Two good options for getting the D3 you need are readily available. One is through suntanning booths and beds, and the other is via supplements.