Last update
3/22/2026
Reviewed By
Overview
SCIENTIFIC SCORE
Moderately Effective
Based on 1 Research
8
USERS' SCORE
Good
Based on 2 Reviews
8.3
Supplement Facts
Serving Size: 1 Vegetable Capsule
Amount Per Serving
%DV
L-Lysine (as L-lysine HCl) (Free Form)
500 mg
**
Top Medical Research Studies
8
We looked into how ketoprofen lysine salt (KLS) mouthwash stacks up against benzydamine hydrochloride (BH) for treating sore throats. In a single-blind study with 241 patients, both mouthwashes were used twice daily for seven days. Results showed that KLS provided longer-lasting pain relief and was better tolerated than BH. While both treatments had some side effects, significantly more BH users reported issues. Overall, it seems KLS might be the more effective option for soothing a sore throat.
Read More
Most Useful Reviews
7.5
Stops illness quickly
9 people found this helpful
Wonderful! I take 2000mg at the first signs of a cold sore or sore throat, 2-3 times a day, and within a few days, it clears up. I and many others I know also take it right at the first sign of illness, as it’s highly effective.
Read More
7.5
Prevents illness
6 people found this helpful
I’ve been using L-Lysine for many years, and although I wish the capsules were easier to swallow, it's become my flu prevention booster. I start taking it immediately when I am exposed to someone sick or if I feel a cold or sore throat coming on. It’s essential to start straight away for effectiveness.
Read More
Medical Researches
SCIENTIFIC SCORE
Moderately Effective
Based on 1 Research
8
- All Researches
8
We looked into how ketoprofen lysine salt (KLS) mouthwash stacks up against benzydamine hydrochloride (BH) for treating sore throats. In a single-blind study with 241 patients, both mouthwashes were used twice daily for seven days. Results showed that KLS provided longer-lasting pain relief and was better tolerated than BH. While both treatments had some side effects, significantly more BH users reported issues. Overall, it seems KLS might be the more effective option for soothing a sore throat.
Read More
User Reviews
USERS' SCORE
Good
Based on 2 Reviews
8.3
- All Reviews
- Positive Reviews
- Negative Reviews
7.5
Stops illness quickly
9 people found this helpful
Wonderful! I take 2000mg at the first signs of a cold sore or sore throat, 2-3 times a day, and within a few days, it clears up. I and many others I know also take it right at the first sign of illness, as it’s highly effective.
Read More
7.5
Prevents illness
6 people found this helpful
I’ve been using L-Lysine for many years, and although I wish the capsules were easier to swallow, it's become my flu prevention booster. I start taking it immediately when I am exposed to someone sick or if I feel a cold or sore throat coming on. It’s essential to start straight away for effectiveness.
Read More
Frequently Asked Questions
No FAQs are available for this product and symptom.
References
- Passà li D, Volonté M, Passà li GC, Damiani V, Bellussi L. Efficacy and safety of ketoprofen lysine salt mouthwash versus benzydamine hydrochloride mouthwash in acute pharyngeal inflammation: a randomized, single-blind study. Clin Ther. 2001;23:1508. PubMed
Data last updated:
