Vitamin D has become one of the most important nutrients to supplement for the majority of Americans. Studies show that a large part of our population is either vitamin D deficient or becomes deficient during the Winter months. My very strong suggestion is that you have your levels of 25-hydroxyvitamin D3 tested in your blood at your next doctor's visit. If you have levels below 32 ng/dl you are vitamin D deficient. Vitamin D is actually a hormone that affects bone, brain, and immune system functions. High dose vitamin D has been shown to be tolerated very well with no significant issues of toxicity. If you take high doses of vitamin D3 (5,000 IU/day or higher) have your blood serum calcium levels checked periodically. Elevation of calcium levels will indicate that you should lower your intake of this hormone.
* Take into consideration the time of year. Vitamin D is made by in your body through sunlight exposure. Thus, your levels will be the highest by the end of summer. If you test low at this time of year you are guaranteed to be deficient during winter months.
Pure vitamin D supplied in 5,000 IU capsules, 1,000 IU capsules, or in separately sold dropper bottle (1,000 IU per drop). The drops have absolutely no taste, so they are a great choice for children or for those taking higher dosages.