Vitamin D – Higher Intake Recommended
Recent evidence suggests that vitamin D intakes above current recommendations may be associated with better health outcomes. Researchers from the Harvard School of Public Health summarized evidence from studies related to bone mineral density (BMD), lower-extremity function, dental health, and risk of falls, fractures, and colorectal cancer. They found that the most advantageous serum concentrations of 25-hydroxyvitamin D begin at 75 nmol/L (30 ng/mL), and the best are between 90 and 100 nmol/L (36-40 ng/mL). They wrote: “… the amount of vitamin D required for optimal benefit may be much higher than would be provided by current recommendations (200-600 IU per day), especially in those with minimal sun exposure.” For bone health in younger adults and all studied outcomes in older adults, an increase in the currently recommended intake of vitamin D is warranted. In no less than 50% of the population, a daily intake for all adults of at least 1000 IU (25 micrograms) vitamin D3 (cholecalciferol) is needed to bring vitamin D concentrations up to 75 nmol/L.