Published: February 8, 2010
To the Editor:

“Vitamin D, Miracle Drug: Is It Science, or Just Talk?” (Well, Feb. 2) addresses the recurring failure of clinical studies to validate observational data on supplementation of individual nutrients.

Dr. Eric A. Klein is correct that supplementing normal levels of specific nutrients is not only unnecessary, but may also be risky. However, we know that C.D.C. data show vitamin D deficiency in more than 50 percent of Caucasians, three-quarters of Latinos and nearly all African-Americans…continue