Vitamin D is fat soluble and isn't cleared by the body as quickly as other vitamins such as B. Therefore it can be taken in higher doses, but less frequently. T

Vitamin D is fat soluble and isn't cleared by the body as quickly as other vitamins such as B. Therefore it can be taken in higher doses, but less frequently. This is often done for convenience sake. A 3000-5000IU pill every week is easier to remember than a 500-600IU pill every day.