what is a healthy vitamin d level
Everyone agrees that anyone with a 25-hydroxyvitamin D level of less than 15 ng/mL or 37.5 nmol/L (depending on the units reported by a lab) needs more vitamin D. The U.S. National Institutes of Health notes that 25-OHD levels over 30 ng/mL are optimal, and that there is insufficient data to support recommendations for higher levels. The Vitamin D Council considers the ideal 25-OHD level to be between 40 ng/mL and 70 ng/mL.