Vitamin D toxicity: No. Vitamin d has no known adverse effects up to levels of 100 ng/ml. Obvious signs of toxicity emerge at levels above 150 ng/ml. Signs of toxicity include: constipation; decreased appetite (anorexia); dehydration; fatigue; irritability; muscle weakness; vomiting; heart rhythm abnormalities; kidney stones; and polyuria (frequent urination).
Answered 6/27/2018
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Levels: The literature is variable about vitamin D levels. However, many sources would advocate 80 ng/ml as an optimal level.
Answered 11/19/2019
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