NAC 1000 mg
by NOW · tablet or pill · 60 tablets
- On the market (NIH)
- UPC 7 33739 00184 9
- DSLD label 335284
- Serving 1 tablet
- 60 servings
NAC 1000 mg by NOW lists one ingredient: 1 g of N-acetyl cysteine per serving of 1 tablet. Its current label entered the NIH Dietary Supplement Label Database on July 24, 2025.
What is in NAC 1000 mg?
Each row as the label prints it, per serving of 1 tablet. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).
| Ingredient | Amount | % DV | Among products listing it |
|---|---|---|---|
| N-Acetyl Cysteine1,000 mg | 1 g | Higher than 96% of 1,259 products listing N-acetyl cysteine (median 150 mg). Per day at the most servings: 3,000 mg. |
Source: NIH ODS Dietary Supplement Label Database, label 335284 (entered July 24, 2025), version 9.4.0. See the label on DSLD or its label image (PDF). Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.
Is that a lot?
The rows in the top or bottom tenth of the products that list the same ingredient, and any above the adult upper limit at the most servings a day the directions give:
- Its 1,000 mg of N-acetyl cysteine is higher than 96% of the 1,259 N-acetyl cysteine products that print an amount; 25 list more.
The NIH database records 1 to 3 servings a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.
The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.
Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.
Which products have the closest formulas?
6 products list the very same ingredients; the nearest amounts come first.
- NACLiveLong · off the market same ingredients
- N-Acetyl-L-CysteineKaruna same ingredients
- N-Acetyl Cysteine 500 mgBIOVEA same ingredients
- N-Acetyl Cysteine 1000 mgDouble Wood Supplements same ingredients
- NAC 1,000 mgLuckyVitamin same ingredients
- NAC N-Acetyl-Cysteine 1000 mgProtocol For Life Balance same ingredients
Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.
What does the label say about taking it?
Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.
- Directions
- Suggested usage: Take 1 tablet 1 to 3 times daily.
- Warnings
- Caution: For adults only. Keep out of reach of children.
- Consult physician if pregnant/nursing, taking medication (especially nitroglycerin), or have a medical condition.
- Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
- Allergens and what it does not contain
- Non-GMO
- Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients.
- Storage
- Store in a cool, dry place after opening.
Source: label statements in DSLD label 335284.
What else is on the label?
Other ingredients: Microcrystalline Cellulose, Hydroxypropyl Cellulose, Stearic Acid, Croscarmellose Sodium, Hypromellose, Stearic Acid, Sunflower Lecithin, Triethyl Citrate, Sunflower Oil, Silicon Dioxide.
Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Triangle K (Kosher); GMP Quality Assured.
How many labels does NAC 1000 mg have?
8 labels are on file under this name since August 26, 2014: other sizes, label designs and reformulations. The current one leads this page.
- Label 335284 (current) Entered July 24, 2025 · on the market · 60 tablets · UPC 7 33739 00184 9
- Label 313861 Entered June 20, 2024 · off the market January 21, 2025 · 60 tablets · UPC 7 33739 00184 9
- Label 313862 Entered May 23, 2024 · off the market January 21, 2025 · 120 tablets · UPC 7 33739 00185 6
- Label 244423 Entered February 25, 2021 · off the market February 12, 2024 · 120 tablets · UPC 7 33739 00185 6
- Label 210367 Entered November 21, 2019 · off the market August 4, 2023 · 120 tablets · UPC 7 33739 00185 6
- Label 70150 Entered January 25, 2017 · off the market September 25, 2019 · 120 tablets · UPC 7 33739 00185 6
- Label 53398 Entered November 24, 2015 · off the market November 30, 2016 · 120 tablets · UPC 7 33739 00185 6
- Label 36293 Entered August 26, 2014 · off the market October 23, 2015 · 120 tablets · UPC 7 33739 00185 6
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names NOW FOODS (manufacturer), Bloomingdale, IL. All NOW products.