Safe Upper Limit of Vitamin D Identified for First Time
A new study examining more than a million individuals aged older than 45 years has, for the first time, verified an upper, safe limit for vitamin D in terms of mortality and cardiovascular events. The researchers also confirm the increased risk of death from suboptimal levels of the vitamin, corroborating the findings of many previous trials.
“In our large comprehensive database, we have determined the safe range of calcidiol blood levels and suggested a threshold for excess vitamin D, beyond which [our study participants] are at increased risk for…all-cause mortality and/or cardiovascular events. We defined a safe range of serum calcidiol of 20 to 36 ng/mL, and we found a U-shape association of the risk for [mortality or acute coronary syndrome] MACS and serum calcidiol,” write Yosef Dror, PhD, from the Hebrew University of Jerusalem, Rehovot, Israel, and colleagues in their paper published online in the Journal of Clinical Endocrinology & Metabolism.
