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Head-to-head evidence comparison — which supplement is right for you?
Black Cohosh vs Vitamin D3: Vitamin D3 has the stronger overall evidence (7.5 vs 5/10); they're alternatives for menopause support — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Vitamin D3 wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
7 of 10 studies with measurable effects showed benefit.
Top outcomes
Verdict
Probably helps
13 of 23 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (2)
Outcomes where both Black Cohosh and Vitamin D3 have evidence — compare verdict strength side-by-side.
20-40mg standardized extract (1mg triterpene glycosides)
Morning and evening, With or without food
Standardized extract (2.5% triterpene glycosides)
2000-4000 IU daily
Morning with breakfast
D3 (cholecalciferol) softgel or liquid
and 1 more not shown
4-8 weeks
4-8 weeks
4-8 weeks
4-8 weeks
4-8 weeks
2-4 weeks
4-8 weeks
Black cohosh extracts in women with menopausal symptoms: an updated pairwise meta-analysis
Menopause (New York, N.Y.) (2023) · Meta analysis · n=2310
However, black cohosh did not significantly improve anxiety (Hedges' g = 0.194, 95% CI = -0.296 to 0.684, P = 0.438) or depressive symptoms (Hedges' g = 0.406, 95% CI = -0.121 to 0.932, P = 0.131).
Modulation of the hypothalamic-pituitary-adrenal (HPA) axis by plants and phytonutrients: a systematic review of human trials
Nutritional neuroscience (2022) · Systematic review
For most phytonutrients, the effects of supplementation on HPA-axis activity in humans is unclear.
Review & meta-analysis: isopropanolic black cohosh extract iCR for menopausal symptoms - an update on the evidence
Climacteric : the journal of the International Menopause Society (2021) · Meta analysis · n=43759
Effect sizes were larger when higher dosages of iCR as monotherapy or in combination with St.
Vitamin D supplementation vs. placebo and incident type 2 diabetes in an ancillary study of the randomized Vitamin D and Omega-3 Trial
Nature communications (2025) · Meta analysis · n=5205
Mean body mass index (BMI) was 27.5 kg/m2 (SD = 5.3), with 51% female and 17% Black race/ethnicity.
Vitamin D Supplementation for Patients with Dysmenorrhoea: A Meta-Analysis with Trial Sequential Analysis of Randomised Controlled Trials
Nutrients (2024) · Meta analysis · n=687
TSA revealed that the current RCTs provide sufficient information.
Vitamin D and respiratory tract infections
BMJ (2017) · Meta analysis · n=11321
12% reduction in respiratory infections overall
Based on multiple meta-analyses showing modest improvement in hot flashes. Isopropanolic extracts (iCR) showed most consistent effects. Effect sizes were larger at higher dosages but evidence shows only moderate benefit overall.
Meta-analysis showed 12% overall reduction in respiratory infections, with greater benefits in severely deficient individuals. Daily dosing more effective than bolus. Conservative estimate assumes most users not severely deficient.
AI-estimated from published studies. Interpret as directional guidance.
Vitamin D3 has a higher evidence score (7.5/10 vs 5/10) and wins in 3 of 3 categories.
For menopause support, Vitamin D3 has a higher relevance score (90 vs 58).
No known interactions between Black Cohosh and Vitamin D3 have been documented in our database. However, always consult a healthcare provider before combining supplements.
Hot flashes, bone, sleep, muscle — the basics that hold up vs the phytoestrogen hype.
The transition years (40s): cycle changes, mood, sleep, brain fog — foundations, vitex, and starting muscle work early.
The honest tier list — proven staples vs situational vs mostly marketing. The hub the other guides feed into.
On Ozempic/Wegovy/Mounjaro? What actually helps — muscle preservation, GI relief, nutrient gaps (no upsell).
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.