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As the lead author in the Australian study put it, "In view of the costs and side effects associated with antihypertensive drugs, the potential to prevent or reduce blood pressure and therefore the risk of hypertension with vitamin D is very attractive.” That logic may apply for other conditions as well.
As to the question of mandatory testing, Aisle7 Chief Science Editor Dr. Alan Gaby points out that questions remain about which reference ranges indicate deficiency, whether the screenings provide meaningful information, and whether low levels of certain vitamin D markers truly indicate low vitamin D status. Fortunately, he suggests, “There is a simple solution to this debate: average adults, with their doctor's approval, supplement with 800 to 1,200 IU per day, which is enough to realize the benefit in most cases, and not so much to risk toxicity.”
Deficiencies are more common in winter, and seen more often in seniors, vegans, and people living in northern latitudes or those with malabsorption due to surgeries, celiac disease, or other intestinal condition.
Marcarelli, Rebekah; “Vitamin D Deficiencies Linked To High Blood Pressure,” HNGN, www.hngn.com/articles/34668/20140626/vitamin-d-deficiencies-linked-to-high-blood-pressure.htm, [accessed 26 June 2014].
Sonawane, Vishakha. Calcium and Vitamin D Supplements Improve Metabolism in Women with Gestational Diabetes: Study, www.hngn.com/articles/34458/20140624/calcium-vitamin-d-intake-improves-metabolism-women-gestational-diabetes-study.htm [accessed 30 June 2014].
Starling, Shane. Vitamin D not helpful for adult asthmatics, www.nutraingredients-usa.com/Trends/Vitamin-D/Vitamin-D-not-helpful-for-adult-asthmatics [accessed 30 June 2014].