“RDA” stands for “recommended dietary allowance.”

​In the United States, for an adult with, or under, 70 years of age, the recommended dietary allowance (RDA) for vitamin D is 600 IU. If you are over 70, the RDA for vitamin D is set at 800 IU. (1)

However, if you look at a bottle of a bestselling vitamin D supplement, you’ll most likely find a much larger number like 5,000 or 10,000 IU.

Do you spend a lot of time indoors?

Have you ever wondered if all that sunlight you are getting through the windows ​could ​be hurting your health instead of helping you?

That’s the kind of questions I sometimes worry about.

If you are pregnant or thinking about getting pregnant, finding satisfying answers to these questions is of the utmost importance.

Both me and my wife supplement with high doses of vitamin D.

Because of this, safety is one of our main concerns.

In this article, I’ll share with you my research on the safety profile of vitamin D, including the lessons we can learn from two case reports of vitamin D overdose, including one​ death.