PlainVitamins

NAC 600 mg

by NOW · capsule · 250 capsules

  • On the market (NIH)
  • UPC 7 33739 00086 6
  • DSLD label 313864
  • Serving 1 capsule
  • 250 servings

NAC 600 mg by NOW lists 3 ingredients, 3 with an amount per serving of 1 capsule, such as 25 mcg of selenium and 600 mg of N-acetyl cysteine. Its current label entered the NIH Dietary Supplement Label Database on June 20, 2024.

What is in NAC 600 mg?

Each row as the label prints it, per serving of 1 capsule. 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).

NAC 600 mg: Supplement Facts rows against the market (DSLD label 313864, January 2026 release)
IngredientAmount% DVAmong products listing it
Selenium25 mcg45%Selenium in NAC 600 mg against 7,658 products25 mcg per serving; the middle half of products list 27 mcg to 100 mcg, the median 55 mcg.DV 55 mcgUL 400 mcg25 mcg

75% of 7,658 products listing selenium give more (median 55 mcg). Per day at the most servings: 50 mcg.

L-Selenomethionine5 mgSelenomethionine in NAC 600 mg against 42 products5,000 mcg per serving; the middle half of products list 50 mcg to 495 mcg, the median 112.5 mcg.5,000 mcg

Higher than 79% of 42 products listing selenomethionine (median 112.5 mcg). Per day at the most servings: 10,000 mcg.

N-Acetyl Cysteine600 mgN-Acetyl Cysteine in NAC 600 mg against 1,259 products600 mg per serving; the middle half of products list 55 mg to 500 mg, the median 150 mg.600 mg

Higher than 80% of 1,259 products listing N-acetyl cysteine (median 150 mg). Per day at the most servings: 1,200 mg.

Source: NIH ODS Dietary Supplement Label Database, label 313864 (entered June 20, 2024), 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?

Every amount on this label with a position sits within the middle 80% of the products that list the same ingredient.

The NIH database records 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?

The products whose ingredient lists overlap most with NAC 600 mg's, rare ingredients counting for more.

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 capsule twice daily.
Warnings
Caution: For adults only. Keep out of reach of children.
Consult physician if pregnant/nursing, taking medication, or have a medical condition.
Do not eat freshness packets enclosed.
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
Keep freshness packets in bottle until it is empty. Keep bottle tightly closed at all times in between usage. Store in a cool, dry place after opening.

Source: label statements in DSLD label 313864.

What else is on the label?

Other ingredients: Hypromellose, Stearic Acid, Citric Acid, Microcrystalline Cellulose.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Triangle K (Kosher); Crescent H (Halal) GMP Quality Assured.

How many labels does NAC 600 mg have?

15 labels are on file under this name since December 23, 2011: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 313864 (current) Entered June 20, 2024 · on the market · 250 capsules · UPC 7 33739 00086 6
  2. Label 313863 Entered May 23, 2024 · on the market · 100 capsules · UPC 7 33739 00085 9
  3. Label 309607 Entered February 22, 2024 · off the market February 12, 2024 · 250 veg capsules · UPC 7 33739 00086 6
  4. Label 296611 Entered June 22, 2023 · off the market February 12, 2024 · 100 veg capsules · UPC 7 33739 00085 9
  5. Label 244369 Entered February 25, 2021 · off the market February 12, 2024 · 100 veg capsules · UPC 7 33739 00085 9
  6. Label 241043 Entered December 26, 2020 · off the market February 12, 2024 · 250 veg capsules · UPC 7 33739 00086 6
  7. Label 177423 Entered May 24, 2018 · off the market October 31, 2020 · 250 veg capsules · UPC 7 33739 00086 6
  8. Label 70119 Entered January 25, 2017 · off the market August 4, 2023 · 100 veg capsules · UPC 7 33739 00085 9
  9. Label 53296 Entered November 24, 2015 · off the market January 12, 2018 · 250 veg capsules · UPC 7 33739 00086 6
  10. Label 53295 Entered November 24, 2015 · off the market November 30, 2016 · 100 veg capsules · UPC 7 33739 00085 9
  11. Label 33437 Entered May 23, 2014 · off the market October 23, 2015 · 250 veg capsules · UPC 7 33739 00086 6
  12. Label 33436 Entered May 23, 2014 · off the market October 23, 2015 · 100 veg capsules · UPC 7 33739 00085 9
  13. Label 13223 Entered December 21, 2012 · off the market November 4, 2013 · 250 vcaps(R) · UPC 7 33739 00086 6
  14. Label 13220 Entered December 21, 2012 · off the market November 4, 2013 · 100 vcaps(R) · UPC 7 33739 00085 9
  15. Label 2834 Entered December 23, 2011 · off the market July 21, 2010 · 100 capsules · UPC 7 33739 00085 9

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 (distributor), Bloomingdale, IL. All NOW products.

Where next?