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I would expect that not to be the cause of your dizziness...
What type dizzy sensation to you feel?
Vertigo? Light headed ? Feel off balance ??
For vitamin D3 I would recommend 800 IU / day and not higher though ...
Too high of vitamin D can potentially cause liver inflammation...
I hope that this information is helpful for you
Let me know if you have further questions or concerns
Anthony Bray MD