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Head-to-head evidence comparison — which supplement is right for you?
Caffeine wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
22 of 25 studies with measurable effects showed benefit.
Top outcomes
Verdict
Probably helps
4 of 8 studies with measurable effects showed benefit.
Top outcomes
100-200mg
Morning, 30-60 minutes before exercise
Pill/capsule for precise dosing
25-50mg for women; 50-100mg for men (start low)
Morning (mimics natural rhythm)
Micronized DHEA capsules
15-45 minutes
30-60 minutes
30-60 minutes
30-60 minutes
4-8 weeks
8-12 weeks
Effect of Acute Caffeine Intake on the Fat Oxidation Rate during Exercise: A Systematic Review and Meta-Analysis
Nutrients (2020) · Meta analysis · n=2020
A subsequent meta-analysis was performed using the random effects model to calculate the standardized mean difference (SMD).
The effects of caffeine intake on weight loss: a systematic review and dos-response meta-analysis of randomized controlled trials
Critical reviews in food science and nutrition (2019) · Meta analysis · n=606
Thirteen RCTs with 606 participants were included in the meta-analyses.
Effect of Caffeine and Nitrates Combination on Exercise Performance, Heart Rate and Oxygen Uptake: A Systematic Review and Meta-Analysis
Nutrients (2024) · Meta analysis · n=95
The meta-analysis revealed that caffeine and nitrates supplementation (CAF+nitrates) did not enhance performance in time trials (TTs) over the CAF alone (g = -0.06; 95% CI = -0.46 to 0.35; p = 0.78) or nitrates alone (g = 0.29; 95% CI = -0.12 to 0.70; p = 0.17).
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.
Based on multiple meta-analyses showing 3-6mg/kg optimal dosing. Performance benefits plateau around 200-300mg with increased jitteriness at higher doses.
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.
AI-estimated from published studies. Interpret as directional guidance.
Caffeine has a higher evidence score (9.5/10 vs 9/10) and wins in 2 of 3 categories.
For boost daily energy, Caffeine has a higher relevance score (98 vs 70).
No known interactions between Caffeine and DHEA have been documented in our database. However, always consult a healthcare provider before combining supplements.