Last update
5/21/2026
Reviewed By
Overview
SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 4 Reviews
8.1
Supplement Facts
Serving Size: 1 Capsule
Amount Per Serving
%DV
N-Acetyl-L-Cystein
500 mg
†
Most Useful Reviews
7.5
Effective for chest cold
11 people found this helpful
In Europe, they refer to N-acetyl cysteine (N-A-C) as Mucomyst, used similarly to Mucinex by Americans. When I have a bad chest cold, I use all three: N-A-C increases phlegm, while Mucinex helps dislodge it, and Ambroxol prevents thickening. This combination is remarkably effective, and N-A-C is the most affordable option.
Read More
8
Easier mucus expulsion
8 people found this helpful
This product is excellent for COPD as it breaks up mucus for easier expulsion. I've experienced an energy boost as well. After issues with the NOW brand, I switched to Jarrow’s lower mg formula, and it’s working well for me. I would suggest reading Natural Therapies by Robert Green Jr. for more information. I believe I experience cold sensitivity as a side effect, feeling chilly for a few minutes, but it's manageable.
Read More
7
Reduced sinus congestion
354 people found this helpful
I’ve been taking N-A-C on and off for over three years, and it has greatly alleviated my sinus congestion. N-A-C supplements provide extra L-cysteine, aiding in the production of Glutathione—essential for our antioxidant defence. I've settled on Jarrow Formulas, which has a combined quick and sustained release formula. This ensures my stomach feels fine and provides consistent levels of L-cysteine. After starting N-A-C, my sinus congestion during cold and allergy season noticeably improved, allowing me to breathe easier and requiring fewer nasal strips.
Read More
User Reviews
USERS' SCORE
Good
Based on 4 Reviews
8.1
- All Reviews
- Positive Reviews
- Negative Reviews
7.5
Effective for chest cold
11 people found this helpful
In Europe, they refer to N-acetyl cysteine (N-A-C) as Mucomyst, used similarly to Mucinex by Americans. When I have a bad chest cold, I use all three: N-A-C increases phlegm, while Mucinex helps dislodge it, and Ambroxol prevents thickening. This combination is remarkably effective, and N-A-C is the most affordable option.
Read More
8
Easier mucus expulsion
8 people found this helpful
This product is excellent for COPD as it breaks up mucus for easier expulsion. I've experienced an energy boost as well. After issues with the NOW brand, I switched to Jarrow’s lower mg formula, and it’s working well for me. I would suggest reading Natural Therapies by Robert Green Jr. for more information. I believe I experience cold sensitivity as a side effect, feeling chilly for a few minutes, but it's manageable.
Read More
7
Reduced sinus congestion
354 people found this helpful
I’ve been taking N-A-C on and off for over three years, and it has greatly alleviated my sinus congestion. N-A-C supplements provide extra L-cysteine, aiding in the production of Glutathione—essential for our antioxidant defence. I've settled on Jarrow Formulas, which has a combined quick and sustained release formula. This ensures my stomach feels fine and provides consistent levels of L-cysteine. After starting N-A-C, my sinus congestion during cold and allergy season noticeably improved, allowing me to breathe easier and requiring fewer nasal strips.
Read More
7.5
Reduced illness frequency
27 people found this helpful
I've been taking Jarrow N-A-C Sustain twice a day for nearly a year now, and it has been brilliant for my mood and gut issues. I've noticed that I don’t catch colds or the flu as easily anymore.
Read More
Frequently Asked Questions
