Head-to-head evidence comparison — which supplement is right for you?
Vitamin D3 wins 1 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
400-1600mg for mood; 600-1200mg for joints
On empty stomach, Morning and/or midday
Enteric-coated tablets (SAMe tosylate or butanedisulfonate)
2000-4000 IU daily
Morning with breakfast
D3 (cholecalciferol) softgel or liquid
2-6 weeks
4-8 weeks
4-8 weeks
4-8 weeks
4-8 weeks
2-4 weeks
4-8 weeks
Comparison of concurrent, resistance, or aerobic training on body fat loss: a systematic review and meta-analysis
Journal of the International Society of Sports Nutrition (2025) · Meta analysis · n=1564
CT reduced significantly more fat mass compared to RT (MD: -1.09 kg [95% CI = -0.27 to -1.91]; p = 0.009).
Optimal duration of antibiotic treatment for community-acquired pneumonia in adults: a systematic review and duration-effect meta-analysis
BMJ open (2023) · Meta analysis · n=2399
We included nine trials (2399 patients with a mean (SD) age of 61.2 (22.1); 39% women).
Needling Point Location Used in Sham Acupuncture for Chronic Nonspecific Low Back Pain: A Systematic Review and Network Meta-Analysis
JAMA network open (2023) · Meta analysis · n=4379
In comparison with SATS, acupuncture was significantly associated with improvements in both pain (SMD, -0.33; 95% CI, -0.52 to -0.15) and function outcomes (SMD, -0.13; 95% CI, -0.25 to -0.02); however, there were no differences between acupuncture and SATV.
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.
Effect of Vitamin D Supplementation in Early Life on Children's Growth and Body Composition: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
Nutrients (2021) · Meta analysis · n=3960
Vitamin D supplementation during pregnancy was associated with higher triceps skinfold thickness (mm) (MD 0.33, 95% CI, 0.12, 0.54; I2 = 34%) in neonates.
Vitamin D3 has a higher evidence score (9/10 vs 9/10) and wins in 1 of 3 categories.
For support mood, SAMe has a higher relevance score (90 vs 75).
No known interactions between SAMe and Vitamin D3 have been documented in our database. However, always consult a healthcare provider before combining supplements.