The research on Vitamin D continues to emerge, and questions of optimum dosage continue to be raised. Some authorities think that 2000 iu should be sufficient for all “healthy” adults, and some feel that biochemical individuality suggests that some so-called “healthy” adults may need 10,000iu or more to be in an optimum state.
Taking more than a few of the Preventics Vitamin D & A supplements with the 2500 iu of Vitamin A added could become a Vitamin A overdose problem if taken over a prolonged period of time.
For that reason, we have changed the formula to a straight Vitamin D. The dosage will remain the same, however the price of the straight Vitamin D is 40% less than the combination Vitamin A and Vitamin D product. Switching to the straight Vitamin D not only creates a greater margin of safety for our customers, it is also more economical.