Yes, D3 is OTC... pick a capsule version, or liquid so it is absorbed better. (I don't think the dry ones are absorbed as well)
There are many many available now:
http://www.iherb.com/search?kw=d3#p=1&sr=0
If you know your D3 level, use 1000 IU / 10ng increase to figure out your dose. The research says most people can take 2000IU safely without a test. But if you don't get any sun at all, I'd start with the newer 5000IU daily.
Both hubby and I use the 5000IU in fall/winter/spring and none in summer.
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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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