What is a toxic level for D3?

These values for 25(OH)D are as follows:

• Toxicity threshold level - 200-250 ng/mL (500-750 nmol/L) ^{4 5 6 7 8}
• Upper limit - 100 ng/mL (250 nmol/L)

The large range between 25(OH)D’s upper limit and its threshold value implies a degree of safety at serum levels up to 100 ng/mL (250 nmol/L), since concentrations twice this amount have yet to ever be associated with toxicity. ⁴
In animal models, serum concentrations have reached as high as 400-700 ng/mL (1,000-1750 nmol/L) before toxic effects (severe hypercalcemia) were observed. ^{8 9}

http://www.vitamindcouncil.org/about-vitamin-d/what-is-vitamin-d/vitamin-d-toxicity/

^{Your holistic doctor is wrong. Check out the latest science along with graphs and charts. The most informative chart is about 9 minutes into the lecture. More vitamin D is needed to fight cancer and heart disease. You can fast forward to the charts.}
http://www.youtube.com/watch?v=TQ-qekFoi-o