Vitamin D is an essential vitamin that your body cannot make on its own. You can obtain it naturally from certain foods and exposure to sunlight. However, many people do not get enough, especially in cold, dark months.

We asked our chief medical officer, Sohaib Imtiaz, MD, if it's really necessary for everyone to take a vitamin D supplement in the winter.

*This interview has been edited and condensed for clarity.

Q: We know that our primary source of vitamin D is sunlight, so it stands to reason that we get less vitamin D in cold, dark months when we have less sun exposure. Who can benefit the most from a vitamin D supplement in the winter?

Imtiaz: Most people might need vitamin D during the winter months, which I would typically define as the period from around October to about Mar

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