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Head-to-head evidence comparison — which supplement is right for you?
NAC wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
9 of 11 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
0 of 1 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (2)
Outcomes where both NAC and Serrapeptase have evidence — compare verdict strength side-by-side.
600-1800mg daily
Away from food, Split into 2-3 doses
NAC capsules or powder
120,000-240,000 SPU (serrapeptase units)
On empty stomach, 30 min before or 2 hours after meals
Enteric-coated capsules (protects from stomach acid)
4-8 weeks
2-4 weeks
1-2 weeks
Immediate
1-2 weeks
1-2 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%).
An up-to-date review of biomedical applications of serratiopeptidase and its biobetter derivatives as a multi-potential metalloprotease
Archives of microbiology (2024) · Systematic review
To overcome such limitations, improved versions of the enzyme were introduced using protein engineering in our previous studies.
Serratiopeptidase: An integrated View of Multifaceted Therapeutic Enzyme
Biomolecules (2022) · Systematic review
Existing serratiopeptidase treatments in combination with antibiotics are popular in the treatment of postoperative swelling.
Fibrinolytic Enzymes for Thrombolytic Therapy
Advances in experimental medicine and biology (2019) · Systematic review
Inability of plasma fibrinolytic system demands better thrombolytic drugs.
Meta-analysis showed efficacy particularly in bipolar disorder patients. Effect appears as adjunctive treatment. Individual response varies significantly.
Based on 3 RCTs in dental surgery patients. Effects were modest and one study showed dexamethasone was superior. Requires enteric-coated formulation for bioavailability.
AI-estimated from published studies. Interpret as directional guidance.
NAC has a higher evidence score (6/10 vs 4/10) and wins in 3 of 3 categories.
For reduce inflammation, Serrapeptase has a higher relevance score (70 vs 60).
No known interactions between NAC and Serrapeptase have been documented in our database. However, always consult a healthcare provider before combining supplements.