"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)".
The significant advantages of D3 supplementation for sun-starved people are evident in the literature.
http://www.mayoclinicproceedings.org/article/S0025-6196(15)0...
"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)".
The significant advantages of D3 supplementation for sun-starved people are evident in the literature.