Calcium Magnesium softgels recall by NOW Foods – excessive vitamin D
3 softgels daily for the following amounts
Vitamin D3 600 IU but was actually 30,000 – 40,000 IU
Calcium 1,000 mg
Magnesium 500 mg
Zinc 10 mg
Now Foods said it has received reports of nausea and elevated blood vitamin D levels
Symptoms of high vitamin D dietary intake also can include fatigue, headaches and loss of appetite, among other side effects.
CLICK HERE for details
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See also VitaminDWiki

Based on the above graph from the above link,
it appears that people would have had to been taking the product for many months to get vitamin D toxicity
Perhaps it was the 1,000 milligrams of Calcium which caused the problems
