NAC has become one of the more talked-about supplements in fertility circles, and for good reason. It raises glutathione, the body’s main antioxidant, and oxidative stress is one of the things working against egg and sperm quality.
But picking the best NAC supplement for women turns out to be a maths problem. Below are six compared on strength, price and form, along with what each one is good for.
What NAC Does for Fertility
NAC is a stable form of the amino acid cysteine, and its main job is raising glutathione — the body’s primary antioxidant. That matters for fertility because oxidative stress damages eggs and sperm, and glutathione is the defence against it.
In women, the research centres on PCOS, egg quality and unexplained infertility. In men, on sperm count and motility. NAC is also used well outside fertility, for liver, respiratory and metabolic health.
For the full picture — what NAC does for PCOS, endometriosis and fibroids, plus the doses used in each — see our guide to NAC for women. This page covers which product to buy.
NAC Dose for Fertility
Disclaimer: It’s essential to consult your doctor or a fertility specialist before taking NAC for fertility. They can advise on the appropriate dosage and potential interactions with any medications you’re taking.
Most research uses 600 to 1,800mg daily, for both men and women. Studies in women have looked at PCOS and unexplained infertility; in men, at sperm count and motility.
The practical part is what that means at the shelf. Every product on this list is 500mg or 600mg per capsule, so:
- 600mg/day — one capsule
- 1,200mg/day — two capsules
- 1,800mg/day — three capsules
That changes how you read the prices below. Nootropics Depot’s 500mg capsule costs about the same as LiverDoctor’s 600mg one, roughly US$0.28 each, but at 1,800mg a day you need four of the first and three of the second: about US$34 (S$43) a month against US$25 (S$32). Work out your dose first, then compare on monthly cost rather than per capsule.
| Product | Per capsule | For about 1,800mg a day | Per month |
|---|---|---|---|
| Now Foods NAC 600mg | S$0.18 (≈US$0.15) | 3 capsules | S$16.57 (≈US$13.08) |
| LiverDoctor NAC 600mg | US$0.28 (≈S$0.35) | 3 capsules | US$25.00 (≈S$31.68) |
| Nootropics Depot NAC 500mg | US$0.28 (≈S$0.36) | 4 capsules (2,000mg) | US$33.98 (≈S$43.06) |
| Myoxcience NAC + Glycine | US$1.17 (≈S$1.48) per scoop | 1 scoop (1,600mg) | US$34.95 (≈S$44.28) |
| Xymogen NAC 600mg | US$0.62 (≈S$0.78) | 3 capsules | US$55.48 (≈S$70.30) |
| BlueBonnet NAC 500mg | US$0.46 (≈S$0.59) | 4 capsules (2,000mg) | US$55.80 (≈S$70.70) |
Prices checked 11 September 2026 on each brand’s own store (US$) or iHerb Singapore (S$), before shipping. Conversions at US$1 ≈ S$1.27.
One exception: if you’re taking NAC for endometriosis rather than general fertility, the protocol is different — 600mg three times a day on three consecutive days per week, then four days off. We’ve covered that in our guide to NAC for women.
Top NAC Supplement for Fertility
1. Xymogen NAC
Xymogen is the best NAC supplement for women who’d rather pay more and stop thinking about it. At 600mg per capsule, three a day gets you to 1,800mg, and the product is purity and contaminant tested — which matters in a category where independent testing regularly finds labels that don’t match the bottle.
This product is made with N-Acetyl-L-Cysteine, capsule (HPMC), stearic acid, magnesium stearate, and silicon dioxide with the claim to supports glutathione synthesis, detoxification of environmental toxins and pollutant, antioxidant activity in all body cells, and healthy respiratory function.
Xymogen NAC
- Pros: Purity and contaminant tested. 600mg means fewer capsules to reach 1,800mg. Minimal excipients.
- Cons: Most expensive per capsule here. At three a day it’s about US$55 (S$70) a month, against US$25 (S$32) for LiverDoctor.
- Price: US$36.99 (≈S$46.87) for 60 caps (US$33.29 on Xymogen autoship)
Best-Value NAC Supplements for Fertility
2. LiverDoctor NAC N-Acetyl-L-Cysteine 600mg
600mg per capsule in a 90-count bottle, which works out to exactly one month at the full 1,800mg dose. Three a day, bottle empty, reorder. No maths.
The capsule is hypromellose, not gelatin, with rice powder and L-leucine as the only other ingredients.
One thing worth following from their own label: take it with a full glass of water, away from food, and not right before bed.
NAC is hard on an empty stomach without enough water, and it can be stimulating late in the day. None of the other brands here say this, but it applies to all of them.
LiverDoctor NAC N-Acetyl L-Cysteine 600mg
- Pros: Among the cheapest per milligram, second only to Now Foods. Hypromellose capsule, so vegetarian. Minimal excipients. 90 capsules covers a full month at 1,800mg daily.
- Cons: No published third-party testing, so you’re trusting the label. It’s a liver-health brand rather than a fertility one, so the marketing won’t speak to what you’re taking it for.
- Price: US$25.00 (≈S$31.68) for 90 × 600mg capsules
3. Nootropics Depot NAC 500mg
Close to LiverDoctor on price per capsule, and the brand’s whole reputation is built on third-party testing — they publish certificates of analysis for their batches, which is unusual in a category where label accuracy is patchy.
The trade-off is the 500mg capsule. At 1,800mg a day that’s four capsules rather than three, so the per-capsule saving narrows once you count the monthly total.
Nootropics Depot NAC 500mg
- Pros: Low price per capsule. Published third-party testing.
- Cons: A US direct-to-consumer brand, so you’re mostly buying through resellers or international shipping rather than local stock.
- Price: US$16.99 (≈S$21.53) for 60 caps, US$0.28 per capsule
NAC Combined with Selenium and Molybdenum
4. Now Foods NAC Plus Molybdenum and Selenium
Now Foods is the best NAC supplement for women who want the minerals bundled in. Alongside 600mg of NAC, each capsule carries 50mcg of molybdenum and 25mcg of selenium — and it’s the cheapest per capsule here, by a distance.
Selenium is the one doing real work. It’s a component of glutathione peroxidase, the enzyme that uses glutathione to neutralise peroxides, so it pairs logically with NAC.
It also matters for thyroid hormone metabolism, and thyroid function affects menstrual cycles and ovulation. Selenium supplementation has research behind it for sperm quality and motility.
Molybdenum is the less compelling half. It’s an essential trace mineral involved in sulphur metabolism and detoxification, but most people get enough from a normal diet, and there’s no fertility research on supplementing it.
Watch the totals if you’re stacking. Three capsules gives you 75mcg of selenium and 150mcg of molybdenum. Selenium’s upper limit is 400mcg daily, so check your prenatal and any other supplements before adding this.
Read More: CoQ10 for Female Fertility: Dose, Egg Quality & What the Evidence Shows
Now Foods NAC Plus Molybdenum and Selenium
- Pros: Cheapest per capsule on this list. Selenium has genuine fertility research behind it. Established brand.
- Cons: Three capsules gets you 75mcg selenium plus 150mcg molybdenum. Selenium has an upper limit of 400mcg daily, so you need to check other supplements before stacking. Most people get enough molybdenum from food.
- Price: S$46.04 (≈US$36.34) for 250 vege caps, S$0.18 per capsule
Best Certified Vegan NAC Supplement
5. BlueBonnet NAC 500 mg Vitamin Capsules
Several products on this list use plant-based capsules, but BlueBonnet is the one that carries actual vegan certification. If that distinction matters to you — and for some people it does — this is the one.
Each capsule contains 500mg of NAC in a vegetable capsule, non-GMO, from a brand that’s been around long enough to have a reputation worth protecting.
BlueBonnet NAC 500mg Vitamin Capsules
- Pros: Certified vegan and vegetarian, not just plant-based by ingredient. Non-GMO. Established brand.
- Cons: 500mg, so four capsules for the full 1,800mg dose. You’re paying for the certification rather than a stronger or better-absorbed formula — if you only need a plant-based capsule, LiverDoctor’s hypromellose version is cheaper.
- Price: US$13.95 (≈S$17.68) for 30 caps
Best NAC Powder Supplement
6. MYOXCIENCE NAC + Glycine Supreme
MYOXCIENCE is the best NAC supplement for women who can’t swallow capsules, or who are already taking so many that one more bottle feels like too much. It’s Gly-NAC — NAC combined with glycine, the other amino acid glutathione is built from — in a powder you mix into water or juice.
The pairing has a real rationale. Glutathione is made from three amino acids: cysteine, glycine and glutamate. NAC supplies the cysteine, which is usually the limiting factor, but glycine can run short too, particularly with age.
Supplying both is the logic behind Gly-NAC, and the research on it is genuinely interesting — though it sits mostly in ageing and metabolic health rather than fertility.
Two practical things before you buy. NAC powder tastes strongly of sulphur, so mix it with juice rather than water and don’t expect to enjoy it. And powder means you control the dose precisely, which is useful if you’re titrating up, but you’ll need a scale or a consistent scoop rather than counting capsules.
MYOXCIENCE NAC + Glycine Supreme
- Pros: Contains NAC and glycine, which may offer synergistic benefits. May support cognitive function, sleep quality, and overall health. Comes in powder form, which is easily absorbed.
- Cons: Costs more per month than the cheapest capsules, though each serving carries 1,600mg of NAC and 3,000mg of glycine. Powdered NAC is an acquired taste! May have a taste that some people find unpleasant.
- Price: US$34.95 (≈S$44.28) for 30 servings
Side Effects of NAC for Fertility
NAC supplementation for fertility is generally considered safe when taken in recommended dosages. However, some potential side effects include:
- Mild gastrointestinal issues: Nausea, vomiting, diarrhea, stomach upset.
- Allergic reactions: Rare but possible, including skin rash, itching, wheezing.
- Exacerbated asthma: In rare cases, it may worsen asthma symptoms.
Additional precautions:
- NAC may interact with certain medications, including blood thinners. Inform your doctor about all medications you take before starting NAC.
- Pregnant or breastfeeding women should avoid NAC unless otherwise advised by a healthcare professional.
- People with certain health conditions like kidney disease or bleeding disorders should consult their doctor before taking NAC.
Read More: NAC Supplement for Women: PCOS, Endometriosis, Fertility & Dose
Who Am I?
Dr. Mark Chern (Ph. D) is a Chinese Medicine practitioner in Singapore, trained in Taipei and active in women’s health since 2011. With over a decade of expertise in treating fertility, pregnancy and various women’s health conditions, Dr Mark is always faced with questions about supplements for fertility and hormone regulation.
He has researched deeply into Melatonin, Inositol and Coq10 for fertility. This article compares six NAC products and covers what dose to take and how many capsules that means.
FAQs
Is NAC good for low AMH?
There’s no evidence NAC raises AMH, and no evidence it lowers it either — AMH reflects how many follicles you have, and no supplement changes that number. What NAC may do is improve the environment those follicles develop in, by reducing oxidative stress. Some studies suggest better ovarian response and egg quality in women with PCOS. The research on low AMH specifically is limited, so treat this as plausible rather than established.
Does NAC thicken uterine lining?
There is limited evidence suggesting NAC may positively impact uterine lining thickness. Some studies show improvement in women with thin lining, but again, more research is needed for conclusive results.
Does NAC prevent miscarriage?
While some studies suggest a reduced risk of miscarriage with NAC supplementation, others haven’t found similar results. This area requires further investigation to understand if NAC has a clear role in miscarriage prevention.
Does NAC help with getting pregnant?
Yes, N-acetylcysteine (NAC) may help improve fertility in women, especially those with polycystic ovary syndrome (PCOS). NAC is an antioxidant that helps reduce oxidative stress, improve insulin sensitivity, and may support ovulation. Some studies suggest NAC can enhance the effectiveness of fertility treatments like clomiphene citrate, leading to better ovulation rates and higher chances of conception.
Is CoQ10 or NAC better?
Both CoQ10 and NAC support fertility, but they work differently:
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CoQ10 improves egg quality by supporting mitochondrial energy production and reducing oxidative damage. It is especially helpful for women over 35 or with poor ovarian reserve.
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NAC primarily improves insulin resistance and reduces oxidative stress, which is beneficial for women with PCOS or chronic inflammation.
What is the role of N-acetylcysteine in female infertility?
NAC plays several roles in improving female fertility:
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Antioxidant support: Reduces oxidative stress that can damage eggs and reproductive tissues.
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Improved insulin sensitivity: Helps regulate blood sugar and hormones in women with PCOS.
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Anti-inflammatory properties: Supports a healthier uterine environment for implantation.
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Improves ovulation: May enhance ovulatory response to fertility medications like clomiphene.
What happens if you take NAC daily?
Taking NAC daily can provide several benefits:
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Boosts antioxidant levels by replenishing glutathione, the body’s master antioxidant.
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Supports liver detoxification and overall health.
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Improves metabolic health by reducing insulin resistance.
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Supports fertility in women with PCOS or oxidative stress issues.
Which NAC brand is best for fertility?
Xymogen, if budget allows — it’s purity and contaminant tested, which matters in a category with inconsistent labelling. For value, Now Foods is the cheapest per capsule, and LiverDoctor or Nootropics Depot cost less than half as much per capsule as Xymogen.
NAC dose for fertility?
600 to 1,800mg daily. Since most capsules are 500 or 600mg, that’s one to three a day. Work out your dose before comparing prices — per-capsule cost is misleading at higher doses.
NAC for men — does it help sperm?
The studies looked at sperm count and motility, using 600 to 1,800mg daily. A 2019 trial found improved motility and lower oxidative stress markers after three months. Sperm take about 72 days to develop, so allow three months minimum.
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