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NOW Supplements L-Lysine
SCIENTIFIC SCORE
Questionable
Based on 6 Researches
6.3
USERS' SCORE
Good
Based on 68 Reviews
8.8
Supplement Facts
Serving Size: 1 Tablet
Amount Per Serving
%DV
L-Lysine (from 637 mg L-Lysine Hydrochloride)
500 mg
**

Top Medical Research Studies

8
Lysine helps reduce cold sore outbreaks
Lysine as a prophylactic agent in the treatment of recurrent herpes simplex labialis.
High relevance to cold sore treatment
We examined the effectiveness of long-term lysine supplementation for preventing cold sores, specifically in individuals with a history of frequent outbreaks. Over a 12-month period, twenty-six volunteers participated in a double-blind study, taking daily doses of 1,000 mg of lysine.

Our findings indicated that those taking lysine experienced significantly fewer lesions compared to the control group. Moreover, when participants stopped the supplementation, their outbreaks increased. Maintaining serum lysine levels above 165 nmol/ml appeared crucial for effectiveness, highlighting lysine's potential benefits in managing recurrent cold sores.
Read More
9
Lysine shows potential for herpes relief
Subjective response to lysine in the therapy of herpes simplex.
High relevance to herpes treatment.
We surveyed 1,543 individuals over six months to explore the impact of lysine on herpes infections, including cold sores. Participants averaged a daily dose of 936 mg of lysine. An impressive 84% reported that this supplement either prevented recurrence or reduced the frequency of outbreaks. When comparing symptoms, 79% found them severe without lysine, while only 8% felt the same when using it. Healing times improved dramatically—90% took six to 15 days to heal without lysine, but 83% healed in five days or less with it. Overall, 88% deemed lysine an effective treatment.
Read More
4
L-lysine lacks preventive effectiveness
Lysine for Herpes Simplex Prophylaxis: A Review of the Evidence.
Low relevance for cold sore treatment.
We explored whether L-lysine can effectively prevent cold sores caused by the herpes simplex virus. Two researchers conducted a thorough literature review, examining various clinical studies.

Despite the interest, our findings indicate that L-lysine supplements, particularly less than 1 g per day, are ineffective for preventing outbreaks. Interestingly, higher doses, exceeding 3 g per day, were reported to enhance patients' overall experience with the condition.

However, we believe more extended studies focusing on higher dosages are necessary for conclusive results, especially for those with specific health concerns.
Read More

Most Useful Reviews

9.5
Herpes resolved
Excellent! My herpes is gone. After suffering from frequent cold sores, I now take lysine 1-3 times daily. I’m very happy with the results.
Read More
9.5
Miracle remedy
This amino acid is a miracle! I’ve had multiple colds and cold sores before, but since taking it, I feel energised and my well-being has improved greatly. I highly recommend it!
Read More
9.5
Less frequent outbreaks
I found that lysine significantly reduced my cold sores to once a year from monthly occurrences. I take 500mg tablets regularly and it even helps with colds.
Read More

Medical Researches

SCIENTIFIC SCORE
Questionable
Based on 6 Researches
6.3
  • All Researches
9
L-lysine shows promise for cold sores
Safety and effectiveness of an L-lysine, zinc, and herbal-based product on the treatment of facial and circumoral herpes.
Moderate relevance based on findings
We examined the effects of L-lysine, paired with botanicals and nutrients, on cold sores caused by the herpes virus. In this pilot study, 30 participants tracked symptoms like itching and soreness, revealing impressive results. By the third day, 40% experienced complete healing, which rose to 87% by day six. While most showed significant improvement, a couple did not respond as well. Importantly, the study had no reported adverse effects, showing that L-lysine could effectively ease cold sore symptoms.
Read More
9
Lysine shows potential for herpes relief
Subjective response to lysine in the therapy of herpes simplex.
High relevance to herpes treatment.
We surveyed 1,543 individuals over six months to explore the impact of lysine on herpes infections, including cold sores. Participants averaged a daily dose of 936 mg of lysine. An impressive 84% reported that this supplement either prevented recurrence or reduced the frequency of outbreaks. When comparing symptoms, 79% found them severe without lysine, while only 8% felt the same when using it. Healing times improved dramatically—90% took six to 15 days to heal without lysine, but 83% healed in five days or less with it. Overall, 88% deemed lysine an effective treatment.
Read More
8
Lysine helps reduce cold sore outbreaks
Lysine as a prophylactic agent in the treatment of recurrent herpes simplex labialis.
High relevance to cold sore treatment
We examined the effectiveness of long-term lysine supplementation for preventing cold sores, specifically in individuals with a history of frequent outbreaks. Over a 12-month period, twenty-six volunteers participated in a double-blind study, taking daily doses of 1,000 mg of lysine.

Our findings indicated that those taking lysine experienced significantly fewer lesions compared to the control group. Moreover, when participants stopped the supplementation, their outbreaks increased. Maintaining serum lysine levels above 165 nmol/ml appeared crucial for effectiveness, highlighting lysine's potential benefits in managing recurrent cold sores.
Read More
4
L-lysine helpful for prevention
Diet in Dermatology: Review of Diet's Influence on the Conditions of Rosacea, Hidradenitis Suppurativa, Herpes Labialis, and Vitiligo.
Moderate relevance to dietary interventions
We investigated how dietary changes and supplements affect skin conditions, focusing on cold sores. The review highlighted L-lysine’s benefits as a preventive measure, which may help ward off outbreaks. However, we found that it doesn't shorten the healing time of existing lesions. While there's plenty of anecdotal support, rigorous evidence remains limited for many dietary interventions in treating skin issues. Understanding these nutritional influences can guide us toward effective management options for cold sores.
Read More
4
L-lysine lacks preventive effectiveness
Lysine for Herpes Simplex Prophylaxis: A Review of the Evidence.
Low relevance for cold sore treatment.
We explored whether L-lysine can effectively prevent cold sores caused by the herpes simplex virus. Two researchers conducted a thorough literature review, examining various clinical studies.

Despite the interest, our findings indicate that L-lysine supplements, particularly less than 1 g per day, are ineffective for preventing outbreaks. Interestingly, higher doses, exceeding 3 g per day, were reported to enhance patients' overall experience with the condition.

However, we believe more extended studies focusing on higher dosages are necessary for conclusive results, especially for those with specific health concerns.
Read More

User Reviews

USERS' SCORE
Good
Based on 68 Reviews
8.8
  • All Reviews
  • Positive Reviews
  • Negative Reviews
9.5
Herpes resolved
Excellent! My herpes is gone. After suffering from frequent cold sores, I now take lysine 1-3 times daily. I’m very happy with the results.
9.5
Miracle remedy
This amino acid is a miracle! I’ve had multiple colds and cold sores before, but since taking it, I feel energised and my well-being has improved greatly. I highly recommend it!
9.5
Less frequent outbreaks
I found that lysine significantly reduced my cold sores to once a year from monthly occurrences. I take 500mg tablets regularly and it even helps with colds.
9.5
Improved skin
I recommend lysine for cold sores and troubled skin. After a month of use, my skin is smoother, without redness or acne. I'm truly pleased with the results!
9.5
Quick healing
I was sceptical, but after taking lysine for cold sores, the swelling reduced significantly by the next day. I’m amazed at how quickly it works!
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