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Head-to-head evidence comparison — which supplement is right for you?
Vitamin D3 wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Probably helps
4 of 8 studies with measurable effects showed benefit.
Top outcomes
Verdict
Probably helps
18 of 30 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both DHEA and Vitamin D3 have evidence — compare verdict strength side-by-side.
25-50mg for women; 50-100mg for men (start low)
Morning (mimics natural rhythm)
Micronized DHEA capsules
2000-4000 IU daily
Morning with breakfast
D3 (cholecalciferol) softgel or liquid
4-8 weeks
8-12 weeks
4-8 weeks
4-8 weeks
2-4 weeks
4-8 weeks
Dehydroepiandrosterone for depressive symptoms: A systematic review and meta-analysis of randomized controlled trials
Journal of neuroscience research (2020) · Meta analysis · n=742
No hormonal changes that indicated any risk to the participants' health were seen.
Hormonal Treatments and Vaginal Moisturizers for Genitourinary Syndrome of Menopause : A Systematic Review
Annals of internal medicine (2024) · Systematic review
Vaginal estrogen, vaginal DHEA, oral ospemifene, and vaginal moisturizers may improve some GSM symptoms in the short term.
TEAS, DHEA, CoQ10, and GH for poor ovarian response undergoing IVF-ET: a systematic review and network meta-analysis
Reproductive biology and endocrinology : RB&E (2023) · Meta analysis · n=2323
Compared with the control group, CoQ10 (OR 2.22, 95% CI: 1.05 to 4.71) and DHEA (OR 1.92, 95% CI: 1.16 to 3.16) had obvious advantages in improving the clinical pregnancy rate.
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 meta-analysis showing OR 1.92 for clinical pregnancy rate in poor ovarian response patients. Effect specific to fertility treatment context with medical supervision. Limited long-term safety data.
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 5.5/10) and wins in 3 of 3 categories.
For bone health, Vitamin D3 has a higher relevance score (92 vs 72).
No known interactions between DHEA and Vitamin D3 have been documented in our database. However, always consult a healthcare provider before combining supplements.