К счастью или нет, но есть еще страны, где местной медицине не все окончательно понятно как витамин Д влияет на продолжительность жизни или другие исходы у пожилых, поэтому проводят РКИ с витаминами или другими (копеечными с точки зрения фарминдустрии) лекарствами:
The D-Health Trial is a randomized placebo-controlled trial, with planned intervention for 5 years and a further 5 years of passive follow-up through linkage with health and death registers. Participants aged 65-84 years were recruited from the general population of Australia. The intervention is monthly oral doses of 60,000 IU of cholecalciferol or matching placebo. The primary outcome is all-cause mortality. Secondary outcomes are total cancer incidence and colorectal cancer incidencе.
We recruited 21,315 participants to the trial between February 2014 and May 2015. The participants in the two arms of the trial were well-balanced at baseline. Comparison with Australian population statistics shows that the trial participants were less likely to report being in fair or poor health, to be current smokers or to have diabetes than the Australian population.
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Contemp Clin Trials. 2016 May;48:83-90.
The D-Health Trial: A randomized trial of vitamin D for prevention of mortality and cancer.
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