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Michael F. Holick: “…the concept that vitamin D is one of the most toxic fat-soluble vitamins has been instilled in the psyche of health regulators and the medical community…The evidence is clear that vitamin D toxicity is one of the rarest medical conditions…”

“… and is typically due to intentional or inadvertent intake of extremely high doses of vitamin D (usually in the range of >50,000-100,000 IU/d for months to years.)

from: Holick MF. Vitamin D Is Not as Toxic as Was Once Thought: A Historical and an Up-to-Date Perspective.
Mayo Clin Proc. 2015 May;90(5):561-4. doi: 10.1016/j.mayocp.2015.03.015.  abstract  full-text