Shane's advice is usually good. In the case of vitamin D he is off the mark.
Vitamin D saves lives.
Vitamin D may increase calcium levels only when there is too much calcium and not enough vitamin A, magnesium, boron and lysine, with prolonged doses of D above 10,000 IU per day.
It has been estimated that 80% of the world's population is deficient in vitamin D. People with 25(OH)D levels below 30 ng/dl have increased risk for cancer and heart attacks. Recent research show that the muscle weakness caused by statins can be ameliorated with vitamin D.
For people who live too far north or too far south it is foolish to not take vitamin D supplements. Much of the natural vitamin D3 is obtained from lamb's wool.
Most people cannot achieve optimal levels of 25(OH) D unless they supplement with at least 5,000 IU daily. In the case of my daughter in IL., she must use 10,000 IU per day. If you are fortunate enough to live south of Atlanta or in New Mexico where Shane lives, then about 20 minutes of sun with 80% body exposure should yield about 10,000 IU.
5,000 IU Vitamin D3 caps cost as little as <4 cents per day:
http://www.vitacost.com/Country-Life-Vi ... 0-SoftgelsA New Yorker cannot vacation in Florida for 4 cents a day.