Ever wonder what’s up with vitamin D and why it’s added to milk? Researchers found long ago that the curious vitamin aids in the body’s absorption of calcium. But recent data is proving vitamin D may also be handy in building muscle strength; reducing asthma incidents; reducing insulin resistance (a.k.a. reducing type II diabetes risk); strengthening the immune system; and fighting cancer.

As a matter of fact, one study showed normal vitamin D blood levels improved insulin sensitivity by 60 percent — more than any antidiabetic drug on the market.

The problem with vitamin D, though, is we can mainly get it one of two ways: Supplements or sunlight. How much sunlight? Most research suggests just 15 minutes a day in the great outdoors — without sunscreen — should do the trick for most people. But more and more, we are hearing researchers also recommend supplementation.

A review of vitamin D supplementation needs in Science News states we need 1,000-2,000 IUs/day to glean the benefits of this vitamin.

Reference: “Vitamin D: What’s Enough? Many People May Need Much More,” Raloff J, Science News, October 16, 2004;166:248-249.

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