Recent meta-analyses of randomized clinical trials (RCTs) have rather consistently shown that daily supplementation with vitamin D (with 400–2000 international units (IU) per day) lowers cancer mortality (but not cancer incidence) by approximately 13% in older adults [ 2 ], even though individual studies failed to reach statistical significance.
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Vitamin D food fortification in European countries: the underused potential to prevent cancer deaths.
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