Best NAC
The best nac we track, ranked by real cost-per-dose — not paid placements. Across 41 brands, 3 are third-party tested in a public registry.
Updated October 2026prices checked what’s changed
How much does NAC cost?
NAC costs a median $0.16 per serving — the cheapest of the 65 we can price per dose is $0.03 per serving, or $0.02/day to reach the commonly-studied 600 mg dose. Prices checked October 2026.
Ranked across 66 products · prices checked Oct 10, 2026
3rd-party testedBulkSupplements.com NAC Powder - N-Acetyl Cysteine 600mg
NSF Certified for Sport brand at $0.03 per serving.
How we rank
We rank by cost-per-dose — price ÷ servings, normalized to the daily dose (600 mg/day) — so bottle sizes and strengths compare fairly. Prices are scraped at publication and re-checked when the catalog refreshes (see the “Prices checked” stamp above). There is no paid placement and no kickback for ordering. Full methodology · Editorial standards.
When cheapest ≠ best value
The cheapest bottle isn’t automatically the best value: a low-absorption form (magnesium oxide is the classic example) can look cheap per milligram yet deliver less of what you actually absorb. Where forms differ, compare cost per absorbed or elemental unit, not the compound weight on the label. A bigger bottle isn’t automatically cheaper per dose either — this list already ranks by cost per dose, so a larger count only wins if it truly costs less per serving. Compare NAC forms.
Our data on this: how much the big bottle saves per serving · the gummy tax · the form premium · the price spread.
Full ranking by cost per dose
Cost-per-serving normalizes price across bottle sizes — a 60-count and a 365-count compare fairly. Top 20 of 66 shown.
- See offer#1Best value2 Pack NAC Supplement (N-Acetyl Cysteine) 1,000mg…
capsule · 1000mg · 960 servings · $29.99
$0.03per serving$0.02 / 600 mg - See offer#2BulkSupplements.com NAC Powder - N-Acetyl Cysteine 600mg
powder · 600mg · 833 servings · $28.97
NSF Sport$0.03per serving1.1× #1$0.03 / 600 mg - See offer$0.06per serving1.9× #1$0.03 / 600 mg
- See offer$0.07per serving2.1× #1$0.07 / 600 mg
- See offer$0.07per serving2.1× #1$0.07 / 600 mg
- See offer$0.07per serving2.1× #1$0.07 / 600 mg
- See offer$0.07per serving2.2× #1$0.07 / 600 mg
- See offer$0.07per serving2.2× #1$0.07 / 600 mg
- See offer$0.07per serving2.3× #1$0.07 / 600 mg
- See offer$0.08per serving2.6× #1$0.04 / 600 mg
- See offer$0.08per serving2.6× #1$0.08 / 600 mg
- See offer$0.08per serving2.7× #1$0.05 / 600 mg
- See offer$0.08per serving2.7× #1$0.08 / 600 mg
- See offer$0.08per serving2.7× #1$0.05 / 600 mg
- See offer$0.09per serving2.7× #1$0.05 / 600 mg
- See offer$0.09per serving2.8× #1$0.09 / 600 mg
- See offer$0.09per serving2.8× #1$0.09 / 600 mg
- See offer$0.09per serving2.9× #1$0.09 / 600 mg
- See offer$0.09per serving3.0× #1$0.09 / 600 mg
- See offer$0.09per serving3.0× #1$0.09 / 600 mg
See also: NAC basics · all best-value rankings · nac cost-per-dose breakdown
Related comparisons, stacks & nutrients
NAC brands we compare — which are third-party tested?
3 of the 41 brands ranked above appear in an independent certifier's own public registry. A certification confirms the label matches the contents — it says nothing about how well the supplement works, and an uncertified brand is not automatically worse.
- BulkSupplements.com NSF Sport
- Natural Factors USP
- Thorne NSF Sport
- Amazing Nutrition
- Best Naturals
- Bluebonnet
- CANLIST
- Carlyle
- Clenoriko
- Country Life
- DEAL SUPPLEMENT
- DORADO NUTRITION
- Double Wood Supplements
- Dr Clark Store
- Dr. Murray Natural Products
- Etta Vita
- HEALTH LFE
- Horbäach
- Life Extension
- MaryRuth's
- MEENCCD
- MegaFood
- Micro Ingredients
- NaturaLife Labs
- Navobary
- NOW
- NOW Foods
- NutraBio
- NUTRAHARMONY
- Nutricost
- Piping Rock
- Premier Research Labs
- PROTOCOL FOR LIFE BALANCE
- Pure Encapsulations
- SEAFLEX
- Swanson
- The Vitamin Shoppe
- Truevantage Nutrition
- Vital Nutrients
- Vykee Nutrition
- WellVeraVida
Frequently asked
How much does NAC cost?+
The cheapest nac we track is $0.03 per serving ($29.99 for 960 servings), against a typical $0.16 per serving across the 65 we can price per dose — about $0.94 a month at the cheapest. That's real cost per dose from live Amazon US prices as of October 2026, not the sticker price.
What is the best-value NAC supplement?+
2 Pack NAC Supplement (N-Acetyl Cysteine) 1,000mg Serving with Reduced… — $0.03 per serving ($29.99 for 960 servings), the lowest cost-per-dose nac in our Amazon US catalog as of October 2026.
How much does NAC cost per day?+
The cheapest nac we track works out to $0.03 per serving, against a typical $0.16 per serving across the 65 we can price per dose; to reach the commonly-studied 600 mg/day dose the cheapest is $0.02/day. Retailers and review sites list a price and a serving size but rarely divide it out — this is what a day actually costs, as of October 2026.
What is the typical cost per dose for NAC?+
About $0.16 per serving across the 65 nac products we can price per dose (combination products are left out — their single label dose belongs to whichever ingredient the product is built around) — the cheapest we track is $0.03 per serving, with most falling between $0.09 and $0.22.
What's the cheapest effective NAC?+
To reach the commonly-studied 600 mg/day dose, 2 Pack NAC Supplement (N-Acetyl Cysteine) 1,000mg Serving with Reduced… is the best value at $0.02 per day — cheaper than bottles that look low-priced per serving but are underdosed.
What is the highest-quality NAC supplement?+
Of the 41 nac brands ranked here, 3 hold a third-party certification we could verify in a public registry: BulkSupplements.com (NSF Certified for Sport), Natural Factors (USP Verified), Thorne (NSF Certified for Sport). Certification means an independent lab confirmed the label matches the contents and screened for contaminants — it does not rate how well the supplement works. The cheapest certified option is BulkSupplements.com NAC Powder - N-Acetyl Cysteine 600mg at $0.03 per serving.
Which NAC brands are third-party tested?+
BulkSupplements.com — NSF Certified for Sport; Natural Factors — USP Verified; Thorne — NSF Certified for Sport. We only count a brand as tested when it appears in the certifier's own public registry (USP Verified, NSF Certified for Sport, Informed Choice), never on a claim printed on the label. The remaining 38 brands on this page have no certification we could verify.
Which NAC is the top rated?+
We don't republish marketplace star ratings — they belong to the retailer, they move constantly, and a 4.6 average tells you nothing about what is in the capsule. The two things you can verify are what a dose costs and whether an independent lab checked the label. On both counts, BulkSupplements.com NAC Powder - N-Acetyl Cysteine 600mg stands out: NSF Certified for Sport certified at $0.03 per serving.
Independent testing
3 of 41 tracked NAC brands here are flagged as carrying independent third-party testing — a voluntary check of a product's identity, potency and contaminants by an outside lab. It's a quality signal, not a value or efficacy claim. Confirm any brand's current status on the official registries:
Testing status is self-reported by the brand or drawn from public certification and may change — always verify on the official registry before purchase.
References & sources
- NAC — Health Professional fact sheet — NIH Office of Dietary Supplements
- USP Verified product participants — U.S. Pharmacopeia
- NSF certified products — NSF
We link primary sources and paraphrase their findings — never copy their text, tables, or images. Cost-per-dose figures are our own first-party catalog data.