The 50,000 used by doctors is D2 Rx... and we now know this is
very ineffective for humans. (so the high number is really meaningless. Ergocalciferol is not active in humans).
This form exists as an historical footnote only. But still doctors continue to use it...and the patients do not benefit at all.
The D3 is cholecalciferol and OTC.
You can take 5000 D3, and get tested in several months to see how you do. People sometimes need more than 1000IU D3 for each 10 pts needed to raise.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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