Vitamin D levels have been quite a topic of conversation and opinion over the past 5 or so years, especially for me as I have had several winters in a row in the past few years and I have an autoimmune disease, SLE (“lupus”). I have been testing and supplementing and testing so this new info is a step in the right direction to confirming what an optimum range is.

There are two scales commonly used: ng/mL and nmol/l.

I converted the numbers cited in the research for this healthy range 20 to 36 ng/mL into the other scale nmol/l,via the website:

healthy range = 50-90 nmol/l  = 20 to 36 ng/mL

Copy from Science Daily:

Apr. 30, 2013 — Researchers claim to have calculated for the first time, the upper safe limit of vitamin D levels, above which the associated risk for cardiovascular events or death raises significantly, according to a recent study accepted for publication in The Endocrine Society’s Journal of Clinical Endocrinology & Metabolism JCEM.Share This:51There is increasing evidence that vitamin D plays a pivotal role in human physiology. Vitamin D deficiency has been linked to cardiovascular events and mortality, but previous studies have found supplementation fails to decrease mortality or cardiovascular events, while other studies found only minor positive effects.”

The unpredictable results from previous studies may be due to the misconception that ‘the higher the better,'” said Yosef Dror, PhD, of Hebrew University in Rehovot, Israel, and lead author of the study. “Although our study did not directly test the impact of vitamin D supplementation, we believe our results suggest it may be possible that only moderate supplementation within a narrow range of serum calcidiol the main vitamin D fraction in the blood will be associated with the most positive results.”

Researchers conducted a study of 422,000 people aged 45 years or older, who underwent vitamin D blood assays. They found for the first time that the safe range of vitamin D levels with respect to coronary morbidity lies between 20 to 36 ng/mL. Vitamin D levels below and above this range adjusted rates of increased mortality and morbidity significantly.

More than 60 percent of the tested population had insufficient blood levels of vitamin D. Half of these subjects had severely low vitamin D levels which was associated with a 1.5 times increased risk of acute coronary morbidity or mortality. Three percent of those tested had elevated vitamin D levels above 36 ng/mL, which was associated with a 1.13 times elevated risk of coronary morbidity or death.

“Supplementing the entire population may jeopardize those found within the upper-normal range, shifting them to levels that are beyond the range associated with the lowest morbidity rates,” said Dror. “Although we could not assess the impact of Vitamin D supplementation, our results may suggest that such supplementation to increase vitamin D blood levels, with strict monitoring to avoid overload, may have a significant influence on public health. This hypothesis still needs to be assessed in intervention trials”

Other researchers working on the study include: Shmuel Meir Giveon of Tel-Aviv University in Israel; and Moshe Hoshen, Ilan Feldhamer, Ran Balicer and Becca Feldman of the Clalit Research Institute, Clalit Health Services in Israel.

via Researchers pinpoint upper safe limit of vitamin D blood levels, study suggests.