N-Acetyl Cysteine
by Source Naturals · tablet or pill · 120 tablets
- Off the market since July 2022 (NIH)
- UPC 0 21078 00170 6
- DSLD label 272434
- Serving 1 tablet
- 120 servings
N-Acetyl Cysteine by Source Naturals lists 2 ingredients, 2 with an amount per serving of 1 tablet, such as 59 mg of calcium and 1 g of N-acetyl cysteine. Its current label entered the NIH Dietary Supplement Label Database on September 22, 2022.
What is in N-Acetyl Cysteine?
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 |
|---|---|---|---|
| Calories | 5 Calories | ||
| Calciumas Dibasic Calcium Phosphate | 59 mg | 4% | 70% of 17,831 products listing calcium give more (median 115 mg). Per day at the most servings: 118 mg. |
| N-Acetyl Cysteine | 1 g | Higher than 96% of 1,259 products listing N-acetyl cysteine (median 150 mg). Per day at the most servings: 2,000 mg. |
Source: NIH ODS Dietary Supplement Label Database, label 272434 (entered September 22, 2022), 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 2 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?
1 product lists the very same ingredients; the nearest amounts come first.
- N-Acetyl Cysteine 1,000 mgSource Naturals same ingredients
- NAC N-Acetyl Cysteine 600 mgVitamin World · off the market 1 shared, 71% alike
- NAC 600GNC · off the market 1 shared, 71% alike
- N-Acetyl Cysteine 600 mgPuritan's Pride 1 shared, 71% alike
- NAC N-Acetyl CysteineXYMOGEN · off the market 1 shared, 71% alike
- N-Acetyl Cysteine 600 mgVitaCeutical Labs 1 shared, 71% alike
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 Use: 1 tablet 1 to 2 times daily.
- Warnings
- Warning: Do not use if you are taking any form of prescription nitrate such as nitroglycerin. If you are pregnant, may become pregnant, or breastfeeding, consult your health care professional before using this product.
- Do not use if either tamper-evident seal is broken or missing.
- Keep out of the reach of children.
- Allergens and what it does not contain
- Non-GMO Validated
- Contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, preservatives, or artificial color, flavor or fragrance.
- Storage
- Keep tightly closed in a cool, dry place.
Source: label statements in DSLD label 272434.
What else is on the label?
Other ingredients: Dibasic Calcium Phosphate, Stearic Acid, Hydroxypropyl Cellulose, modified Cellulose Gum, Silica, Magnesium Stearate.
How many labels does N-Acetyl Cysteine have?
2 labels are on file under this name since April 25, 2017: other sizes, label designs and reformulations. The current one leads this page.
- Label 272434 (current) Entered September 22, 2022 · off the market July 6, 2022 · 120 tablets · UPC 0 21078 00170 6
- Label 72912 Entered April 25, 2017 · off the market December 22, 2021 · 120 tablets · UPC 0 21078 00170 6
DSLD also links this label to: N-A-G 500 mg (package size difference, same product), N-A-G 500 mg (package size difference, same product), N-Acetyl Cysteine 1,000 mg (image difference, same product).
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names Source Naturals, Inc. (distributor), Santa Cruz, CA. All Source Naturals products.