Vitamin D supplements seem to be all the rage for health and longevity these days. How do we know if we really need them? We asked our chief medical officer, Sohaib Imitiaz, MD, to break it down.

Q: How can we learn our vitamin D levels and how to get the right amount/choose the right supplement?

Imitiaz: You have to get a blood test to know your vitamin D level. Those levels are tested in the unit nmol/L.

For most people:

Above 125 is too high.

50 or above is adequate

Between 30 and 50 is insufficient. You’re not going to have the major symptoms of vitamin D deficiency , which can be quite extreme, but you’ll still feel fatigue and see signs of quicker aging.

Below 30 is deficient.

Most people’s vitamin D levels will naturally be lower in the winter, when there's less sunlight.

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