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Plain-language verdict per shared outcome, pooled from the studies behind each supplement. Shows which one the evidence backs for the same goal.
Direct side-by-side from the meta-analysis. Each row is an outcome where ≥2 of your selected supplements have pooled data. Best effect per row highlighted.
| Outcome | Vitamin B12 | Vitamin D3 |
|---|---|---|
| Support mood — Depression − better · points (PHQ-9) | −1.6 weak | −2.1best weak |
500-1000mcg daily for maintenance; higher for deficiency
Morning · with food (preferred)
Methylcobalamin (sublingual)
2000IU
Morning · with food
D3 (cholecalciferol) softgel or liquid
2-4 weeks
4-8 weeks
Weeks to months
4-8 weeks
4-8 weeks
2-4 weeks
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