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Head-to-head evidence comparison — which supplement is right for you?
Maca vs NAC: NAC has the stronger overall evidence (6 vs 5.5/10); they're alternatives for male fertility — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
NAC wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
3 of 3 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
6 of 7 studies with measurable effects showed benefit.
Top outcomes
1500-3000mg
Morning or early afternoon, With food
Gelatinized maca powder (easier to digest)
600-1800mg daily
Away from food, Split into 2-3 doses
NAC capsules or powder
6-12 weeks
4-8 weeks
4-8 weeks
4-8 weeks
2-4 weeks
1-2 weeks
Immediate
Effects of Maca (Lepidium meyenii Walp.) on Physical Performance in Animals and Humans: A Systematic Review and Meta-Analysis
Nutrients (2024) · Meta analysis
They revealed a large effect for all outcomes (SMD: FST = 2.26, RRT = 6.26, GST = 5.23, LA = -1.01, and BLA = -1.70).
A review of the study of active components and their pharmacology value in Lepidium meyenii (Maca)
Phytotherapy research : PTR (2021) · Review
Additionally, the research on the change of active components in Maca at different growth stages by MS will be beneficial to full utilization of active components in Maca and other natural resources.
Enhancement of Interferon-γ Secretion by Lepidium meyenii Extract Supplementation After Exhaustive Endurance Exercise in Healthy Men: A Double-blind, Placebo-controlled Trial
International journal of medical sciences (2025) · Rct · n=20
Regarding the main time effect, the number of lymphocytes in all participants was significantly lower at 2 and 4 hours after exercise than before supplementation.
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%).
Based on meta-analysis showing large effect sizes for physical performance outcomes. Effects may vary significantly between raw and gelatinized forms. Limited human studies with small sample sizes.
Meta-analysis showed efficacy particularly in bipolar disorder patients. Effect appears as adjunctive treatment. Individual response varies significantly.
AI-estimated from published studies. Interpret as directional guidance.
NAC has a higher evidence score (6/10 vs 5.5/10) and wins in 2 of 3 categories.
For male fertility, NAC has a higher relevance score (82 vs 80).
No known interactions between Maca and NAC have been documented in our database. However, always consult a healthcare provider before combining supplements.
CoQ10, zinc, selenium, carnitine modestly help sperm parameters — but live-birth evidence is weak.
Hot flashes, bone, sleep, muscle — the basics that hold up vs the phytoestrogen hype.
The transition years (40s): cycle changes, mood, sleep, brain fog — foundations, vitex, and starting muscle work early.
Mostly hype unless you’re deficient — what has modest evidence vs what doesn’t, and when to see a doctor.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.