A review published in Frontiers in Nutrition has found that vitamin D deficiency affects between 30% and more than 90% of healthcare workers, depending on the study and geographic region, according to the study authors. The review identified indoor work environments and limited sun exposure as key risk factors. It included 36 studies focusing on healthcare workers as a population with significant indoor time. Separate data indicate that 29% of U.S. adults are clinically deficient in vitamin D, with 42% having insufficient levels, according to a 2026 report from NaturalNews.com citing Raymond Francis in “The Great American Health Hoax” [1]. Modern lifestyles that…

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