Both the Mayo Clinic and WebMD are wrong. To put 2,000 IU into perspective, when you go out and expose most of your body to the sun for 30 minutes your skin pro

Both the Mayo Clinic and WebMD are wrong. To put 2,000 IU into perspective, when you go out and expose most of your body to the sun for 30 minutes your skin produces anywhere from 10,000 IU to 50,000 IU. The body evolved this process for a reason, and anything less than 4,000 IU per day is probably not enough. The average man uses 5,000 IU every day and this increases when fighting illness or chronic disease.[1] There are zero reported cases of vitamin D toxicity on doses less than 40,000 IU per day [2]. I'm not saying go out and take 40,000 IU every day, but 5,000 - 10,000 IU per day is right in the range (you should be on the high end of this if your at high-risk for deficiency i.e. if you are black, obese, work indoors everyday and don't see the noon-sun much, always wear sunscreen when going outside, or live far from the equator) Here's a good look at the latest research on vitamin D toxicity, for anybody who's interested. http://www.vitamindcouncil.org/vitaminDToxicity.shtml http://www.vitamindcouncil.org/vitaminDToxicity.shtml [1] Vitamin D binds to T-cells to activate immune response http://www.scientificamerican.com/blog/post.cfm?id=another-reason-vitamin-d-is-importa-2010-03-07 http://www.scientificamerican.com/blog/post.cfm?id=another-r... [2] Vitamin D supplementation, 25-hydroxyvitamin D concentrations, and safety. http://www.ncbi.nlm.nih.gov/pubmed/10232622 http://www.ncbi.nlm.nih.gov/pubmed/10232622