Research
Micronutrients & recovery
Vitamin D supplementation reduces the incidence of respiratory tract infections, with protective effects being more pronounced with daily dosing compared to bolus doses.
Consider daily Vitamin D supplementation, especially if you have limited sun exposure. Meta-analyses suggest daily dosing is more effective than occasional large bolus doses for preventing respiratory infections.
GoodSupportsHIGH confidence
Significantly fewer respiratory tract infections were observed following a vitamin D supplementation. (OR: 0.58, CI: 0.417–0.812)... This was more pronounced by individual daily dosing compared to bolus doses (OR = 0.51 vs. OR = 0.86, p = 0.01).
Why this rating
Based on meta-analyses of RCTs, providing higher quality evidence than single observational studies.
Source
Strengthening the Immune System and Reducing Inflammation and Oxidative Stress through Diet and Nutrition: Considerations during the COVID-19 Crisis
Mohammed Iddir et al. · Nutrients · 2020
DOI 10.3390/nu12061562
narrative_reviewCited 788×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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