Every answer returns to its source.
Ask a medical question. Cokro retrieves, reads, and cites the literature — so you see not just what the evidence says, but where it comes from.
Try: “Does vitamin D supplementation reduce the risk of upper respiratory tract infections in adults?”
Citations are the interface.
Every claim in an answer links directly to its source. See study types, journal, and year — at a glance.
Vitamin D supplementation shows a modest protective effect against acute respiratory tract infections (OR 0.88, 95% CI 0.81–0.96), with stronger benefit in those with baseline deficiency (<25 nmol/L). Daily or weekly dosing appears more effective than bolus regimens.
Overall risk reduction of 12% (OR 0.88) for vitamin D supplementation vs placebo in preventing acute respiratory infections.
Effect stronger in participants with baseline 25(OH)D <25 nmol/L (OR 0.70, 95% CI 0.55–0.89).
Daily or weekly dosing superior to large intermittent bolus dosing (OR 0.81 vs OR 0.97).
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Three arcs. One wheel. Everything returns to the source.