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Head-to-head evidence comparison — which supplement is right for you?
Vitamin D3 wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
1 of 1 studies with measurable effects showed benefit.
Top outcomes
Verdict
Probably helps
15 of 26 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Pterostilbene and Vitamin D3 have evidence — compare verdict strength side-by-side.
50-100mg daily
Morning with breakfast, Can be divided into two doses
Pterostilbene capsules
2000-4000 IU daily
Morning with breakfast
D3 (cholecalciferol) softgel or liquid
4-8 weeks
6-12 weeks
4-8 weeks
Weeks
4-8 weeks
4-8 weeks
2-4 weeks
4-8 weeks
Resveratrol and Its Analogues: Anti-ageing Effects and Underlying Mechanisms
Sub-cellular biochemistry (2024) · Systematic review
The anti-ageing mechanisms of resveratrol and its analogues are complex and multifactorial, involving suppressing oxidative stress, ameliorating inflammation, activating SIRT1 pathway, reducing DNA damage, etc.
Antiobesity pathways of pterostilbene and resveratrol: a comprehensive insight
Critical reviews in food science and nutrition (2024) · Systematic review
Stilbenes are products of the plant phenylpropanoid pathway.
Dietary Supplementation With NAD+-Boosting Compounds in Humans: Current Knowledge and Future Directions
The journals of gerontology. Series A, Biological sciences and medical sciences (2023) · Systematic review
Limitations are identified and future research directions are suggested to further our understanding of the potential efficacy of NAD+-boosting compounds for improving physiological function and extending human health span.© The Author(s) 2023.
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 RCT with n=111 NAFLD patients showing reduced hepatic inflammation markers and ceramide 14:0 levels. Conservative estimate given single study and disease-specific population.
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 (9/10 vs 7/10) and wins in 2 of 3 categories.
For healthy aging, Pterostilbene has a higher relevance score (75 vs 55).
No known interactions between Pterostilbene and Vitamin D3 have been documented in our database. However, always consult a healthcare provider before combining supplements.