Vitamin D3 (cholecalciferol) is essential for calcium absorption, bone health, and immune function.
1000-4000 IU daily, depending on individual needs and blood levels.
Strong evidence from multiple high-quality studies.
Methodology
Meta-analysis
Participants
0 subjects
Key Outcomes
Reduced fracture risk across 12 trials
Bischoff-Ferrari et al. (2009). Archives of Internal Medicine
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Methodology
Meta-analysis
Participants
0 subjects
Key Outcomes
Confirmed reduced respiratory infections across 25 trials
Martineau et al. (2017). BMJ
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Methodology
Review
Participants
0 subjects
Key Outcomes
Highlighted importance for overall health
Holick (2007). New England Journal of Medicine
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Disclaimer: This information is for educational purposes only and not intended as medical advice. Please consult with a healthcare professional before taking any supplements, especially if you have underlying health conditions or are taking medications.