SUPPLEMENTATION BOOM. “At some point in the last decade, screening blood for vitamin D levels became a routine part of medical care. Feeling a little low this winter? Get a vitamin D test. Think you didn’t get enough sun last summer? Check your vitamin D levels. In less than ten years, the amount insurers spent on testing rose from $1 million (in 2000) to $129 million (by 2008). Seventy-five percent of Americans are now on vitamin D supplements.”
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