Can we Trust What is in that bottle?

Can we trust what is in that bottle? In February this year, a study  was published by Kaiser Permanente in the Journal of the American Medical Association:Internal Medicine investigating the contents of vitamin D supplements. Researchers performed an independent analysis of several over-the-counter vitamin D supplements, and the results were stunning: the contents of the vitamin varied from as little as 9 percent of what was stated on the label to as much as 146 percent of the amount of vitamin D listed on the bottle. 55 different products manufactured by 12 companies were tested. Differences were found not only from one product to another, but even between pills in the same bottle.