You can read the answer that I've already given by: Kerri Knox, RN- The Immune Queen!
No, I don't have an explanation for ANYTHING drug companies do, but you can read the answer that I've given to Trish for that EXACT question on the Vitamin D and Magnesium page.
And then you can use this as an opportunity to NOT take Prescription Vitamin D since you shouldn't be taking that prescription, which is vitamin d2, anyway...
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