1. O'dog lives at a far north latitude thus like most of the population here receives very little to no vitamin D in the form of sun exposure. 2. O'dog tested very low in vitamin D and was told to supplement. 3. Docs know and watch my levels.
The current recommendation of 400iu day is too low:
The Linus Pauling Institute recommends that generally healthy adults take 2,000 IU (50 mcg) of supplemental vitamin D daily. Most multivitamins contain 400 IU of vitamin D, and single ingredient vitamin D supplements are available for additional supplementation. Sun exposure, diet, skin color, and obesity have variable, substantial impact on body vitamin D levels..."
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Yes, Vitamin D is fat soluble and too much can accumulate and cause toxicity. However the limits set years ago are very low. There is little risk of toxicity under 10,000iu per day.
"...When the Food and Nutrition Board of the Institute of Medicine established the tolerable upper intake level (UL) for vitamin D, published studies that adequately documented the lowest intake levels of vitamin D that induced hypercalcemia were very limited. Because the consequences of hypercalcemia are severe, the Food and Nutrition Board established a very conservative UL of 2,000 IU/day (50 mcg/day) for children and adults (see table below) (30). Research published since 1997 suggests that the UL for adults is likely overly conservative and that vitamin D toxicity is very unlikely in healthy people at intake levels lower than 10,000 IU/day (39, 97, 98)."
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