The Chicago Blackhawks are the first vitamin D team in modern professional sports history.

According to sources, the Chicago Blackhawk team physicians began diagnosing and treating vitamin D deficiency in all Blackhawk players about 18 months ago. Apparently, most players are on 5,000 IU per day.

After many losing seasons, last year the Blackhawks came out of nowhere to get to the Western conference finals. This year they are playing even better.

Improved athletic performance is only one of the benefits for the Blackhawk players. The other is a reduction in the number and severity of colds and flu and a reduction in the number and severity of repetitive use injuries.

Six months ago, Runner’s World published a story on vitamin D and physical performance.

Asp K. Running on D: The “sun vitamin” may boost performance, but you probably aren’t getting enough. Runners World, December 2009.

A year ago, the flagship journal of the American College of Sports Medicine was the first journal to publish the theory that vitamin D would improve athletic performance.

Cannell JJ, Hollis BW, Sorenson MB, Taft TN, Anderson JJ. Athletic performance and vitamin D. Med Sci Sports Exerc. 2009 May;41(5):1102-10.