you will want to use D3.
NatureMade and other good companies are now making D3 in 1000IU doses
over the counter. There are a few online places offering it in higher doses.
NOW has a version that is dissolved in oil. NatureMade is a dry tablet.
I just switched to NOW this week.(I suspect the oil version is better absorbed).
Fortunately it is not yet expensive.
This is the one I am using currently (2 perday)
http://www.iherb.com/ProductDetails....1&pid=543&at=0
CountryLife has a new one:
http://www.iherb.com/ProductDetails....333038146&at=0
2500IU
I don't know what to tell you about the parathyroids. They may get better with the D3. Many people develop a secondary hyperparathyroid issue, so it is good you don't have that.
This site explains more, but be aware it is confusing at first.
http://www.parathyroid.com/low-vitamin-d.htm
The fact that your parathyroid is low, is probably a "good thing".
The gist is that you should have a serum calcium drawn after your D3 levels normalize just to be sure.
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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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