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The recommended daily intake for vitamin D is a common source of confusion. Some experts recommend 400–800 IU per day, while others recommend 2000 IU.
The confusing part is:
• Vitamin D supplements are measured in IU
• Vitamin D blood levels are measured in ng/mL
• 20 ng/mL is considered low
• 40–60 ng/mL is often considered optimal
If someone with low vitamin D already has thousands of IU stored in their body, why are the recommended amounts so low? That’s where the confusion begins.
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Dr. Eric Berg, DC, not MD; information only