Human beings do not make vitamin D2, and most healthy fish contain vitamin D3. Vitamin D3 is the same price as vitamin D2. Vitamin D3 may be less toxic than D2 because higher concentrations of D2 ...
Overdoing supplements is the prime cause of toxicity, not your diet or too much exposure to the sun ... vitamin D status is likely to be ignored. What is the difference between vitamin D2 and D3?