Amino Acid
N-Acetyl Cysteine (Fertility)
Antioxidant that supports glutathione, may help PCOS and male fertility.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Every N-Acetyl Cysteine (Fertility) product we have scored
| # | Product | Score | Per serving |
|---|---|---|---|
| 1 | Life Extension N-Acetyl-L-Cysteine | 94 A | $0.20 |
| 2 | Sports Research NAC Capsules, N-Acetyl-Cysteine, 600 mg | 92 A | $0.23 |
| 3 | NOW Foods NAC | 89 A | $0.12 |
| 4 | Country Life NAC, N-Acetyl Cysteine 750 mg | 86 A- | $0.51 |
| 5 | NOW Foods NAC Quercetin & Zinc | 84 A- | $0.57 |
| 6 | Swanson Ultimate Respiratory Defense with NAC and Quercetin | 84 A- | $0.53 |
| 7 | Carlson NAC (N-Acetyl Cysteine) | 84 A- | $0.33 |
| 8 | NutraBio Immune | 83 A- | $1.33 |
| 9 | NOW Foods Clinical Strength Ocu Support | 81 A- | $0.73 |
| 10 | Bluebonnet Nutrition JUSTBREATHE | 75 B+ | $1.03 |
| 11 | Carlson Glutathione Booster | 74 B+ | $0.62 |
| 12 | Country Life Aller-Max | 74 B+ | $0.69 |
Scored on dose accuracy, form, label transparency and third-party testing. Per-serving cost is list price divided by servings per container. No brand pays to be listed or ranked.
Common questions
How much N-Acetyl Cysteine (Fertility) should I take?
The typical range is 600-1800mg daily. 3 months before conception
When should I take N-Acetyl Cysteine (Fertility)?
Divided doses, away from meals. Away from food for best absorption.
Which form of N-Acetyl Cysteine (Fertility) is best?
Capsules — Standard. Other forms in the catalog: Powder, Sustained-release.
Is N-Acetyl Cysteine (Fertility) safe?
Commonly reported: GI upset, Sulfur odor, Nausea. Serious warnings: May thin mucus (also cervical). Generally safe
Which N-Acetyl Cysteine (Fertility) supplement scores highest?
Life Extension N-Acetyl-L-Cysteine, at 94/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.
Primary uses
- PCOS
- Ovulation
- Sperm quality
- Antioxidant
How it works
- Glutathione precursor
- Antioxidant for reproductive tissues
- May support ovulation in PCOS
- May improve sperm quality
Dosage
- Typical range
- 600-1800mg daily
- Timing
- Divided doses, away from meals
- With food
- Away from food for best absorption
- Duration
- 3 months before conception
- Special populations
- PCOS, male fertility, antioxidant support
Forms
- Capsules
- Powder
- Sustained-release
Safety
Common side effects
- GI upset
- Sulfur odor
- Nausea
Contraindications
- Active bleeding
- With nitroglycerin
Products containing N-Acetyl Cysteine (Fertility)
Top-scoring supplements in our catalog that list N-Acetyl Cysteine (Fertility) on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Evidence notes
Good evidence for PCOS ovulation and male fertility
Grade B: Some human trials support key claims; further confirmation needed.
Related in Amino Acid
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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.