Available high- quality RCTs did not support a beneficial effect of cholecalciferol on systemic IL-6 and CRP .
Vitamin D and health in adults in Australia and New Zealand: a position statement.
The prevalence of vitamin D deficiency varies , with the groups at greatest risk including housebound , community-dwelling older and /or disabled people , those in residential care , dark-skinned people ( particularly those modestly dressed ) , and other people who regularly avoid sun exposure or work indoors . Most adults are unlikely to obtain more than 5%-10 % of their vitamin D requirement from dietary sources . The main source of vitamin D for people residing in Australia and New Zeal and is exposure to sunlight . A serum 25-hydroxyvitamin D ( 25-OHD ) level of ≥ 50 nmol/L at the end of winter ( 10 - 20 nmol/L higher at the end of summer , to allow for seasonal decrease ) is required for optimal musculoskeletal health . Although it is likely that higher serum 25-OHD levels play a role in the prevention of some disease states , there is insufficient evidence from r and omised controlled trials to recommend higher targets . For moderately fair-skinned people , a walk with arms exposed for 6 - 7 minutes mid morning or mid afternoon in summer , and with as much bare skin exposed as feasible for 7 - 40 minutes ( depending on latitude ) at noon in winter , on most days , is likely to be helpful in maintaining adequate vitamin D levels in the body . When sun exposure is minimal , vitamin D intake from dietary sources and supplementation of at least 600 IU ( 15 µg ) per day for people aged ≤ 70 years and 800 IU ( 20 µg ) per day for those aged > 70 years is recommended . People in high-risk groups may require higher doses . There is good evidence that vitamin D plus calcium supplementation  effectively reduces fractures and falls in older men and women
Available high- quality RCTs did not support a beneficial effect of cholecalciferol on systemic IL-6 and CRP .