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Head-to-head evidence comparison — which supplement is right for you?
NAC wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
8 of 9 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
1 of 1 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (2)
Outcomes where both NAC and Pterostilbene have evidence — compare verdict strength side-by-side.
600-1800mg daily
Away from food, Split into 2-3 doses
NAC capsules or powder
50-100mg daily
Morning with breakfast, Can be divided into two doses
Pterostilbene capsules
4-8 weeks
2-4 weeks
1-2 weeks
Immediate
4-8 weeks
6-12 weeks
4-8 weeks
Weeks
Efficacy of N-Acetylcysteine in Polycystic Ovary Syndrome: Systematic Review and Meta-Analysis
Nutrients (2025) · Meta analysis · n=2515
NAC was associated with a statistically significant increase in progesterone (SMD 0.95, 95% CI: 0.13-1.77, p = 0.02) and endometrial thickness (SMD 0.58, 95% CI: 0.10-1.06, p = 0.02) compared to the placebo and other drugs (SMD 0.71, 95% CI: 0.48-0.94, p < 0.0001).
Efficacy of N-acetylcysteine for patients with depression: An updated systematic review and meta-analysis
General hospital psychiatry (2024) · Meta analysis · n=904
Our findings indicate that adjunctive NAC can ameliorate depressive symptoms in patients with psychiatric problems, particularly bipolar disorder.
N-acetylcysteine as a treatment for substance use cravings: A meta-analysis
Addiction biology (2024) · Meta analysis · n=623
The most targeted substance in the clinical trials was alcohol (3/9; 33.3%), followed by tobacco (2/9; 22.2%) and multiple substances (2/9; 22.2%).
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.
Meta-analysis showed efficacy particularly in bipolar disorder patients. Effect appears as adjunctive treatment. Individual response varies significantly.
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.
AI-estimated from published studies. Interpret as directional guidance.
NAC has a higher evidence score (8/10 vs 7/10) and wins in 2 of 3 categories.
For healthy aging, Pterostilbene has a higher relevance score (75 vs 65).
No known interactions between NAC and Pterostilbene have been documented in our database. However, always consult a healthcare provider before combining supplements.