Herpes virus 1, also known as HSV-1, is a virus responsible for the formation of painful lesions in the mucous membrane areas, as well as virus-dependent canker sores in the mouth and throat, which heal from about eight days to even two weeks. Once infected, the body remains a carrier forever, and recurrences become a troublesome sign of weakened immunity – but lysine supplementation may prove to be a way to reduce them.
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How does lysine work on herpes? Mechanism of action
Lysine is one of the essential amino acids, meaning those that the human body cannot synthesize on its own and must obtain from diet or supplements. Its importance in the context of herpes is primarily related to its influence on the proliferation of the HSV-1 virus, responsible for the formation of lesions. This virus requires arginine for replication – another amino acid that acts as a kind of “fuel” for it.
Lysine acts antagonistically towards arginine: it competes with it for absorption in the intestines and transport into cells, which can lead to a reduction in the availability of arginine for the virus. As a result, the HSV-1 replication process is slowed down, and viral activity is limited. This very relationship between lysine and arginine is crucial in the prevention and alleviation of herpes symptoms – shifting the balance in favor of lysine can hinder viral development and shorten the duration of the infection, keeping the virus in a state of remission.
Effectiveness of lysine in scientific studies
In scientific literature, the effects of using lysine in the context of herpes are described as mixed, although they provide some indications that this amino acid may have real supportive potential. Some clinical studies suggest that regular lysine supplementation – especially in doses of around 1 g several times a day and in combination with a diet restricting arginine – is associated with a lower frequency of herpes recurrences and a shorter healing time for emerging lesions compared to placebo. In one long-term study, a significant reduction in the number of recurrences and a shortening of the lesion treatment period were observed after a year of supplementing with 500 mg of lysine daily, with the possibility of increasing the dose at the first signs of recurrence. In such protocols, an average reduction of even about 60% in the number of recurrences and a nearly halved duration of their course were observed in some study participants.
At the same time, not all studies unequivocally confirm the benefits of lysine – some systematic analyses did not show a significant difference between lysine and placebo in preventing recurrences, which indicates the need for further, larger clinical trials with high methodological quality.
From the available data, however, it appears that lysine works best as a supportive measure when used preventively, before recurrences occur, or early after the first symptoms appear, before herpes lesions develop. In such situations, it can contribute to extending the time between episodes and to alleviating the severity and shortening the healing of existing lesions.
Lysine dosage for herpes – practical recommendations
Although the basis of lysine’s action and the results of some studies are promising, current evidence is still insufficient to precisely determine optimal doses, and it points more to its potential as a supplement rather than a treatment for already existing herpes. Currently, regarding dosage, we can refer to information contained in studies whose participants felt a change after starting supplementation:
- participants took a prophylactic dose of 500 mg of L-lysine on an empty stomach between subsequent recurrences – such a dose extended the time between subsequent recurrences
- the dose was increased to 3000 mg when patients felt the onset of herpes lesion formation, to alleviate the intensity of the lesions.
Currently, the longest study period lasted 8 years – lysine used according to recommendations during this time showed no negative effects. Patients reported a decrease in the frequency or intensity of herpes lesions after just four months of using L-lysine in combination with a diet lower in L-arginine.
Most common mistakes in using lysine for herpes
As mentioned earlier, some studies have shown a lack of efficacy for lysine – however, based on the data contained therein, we can also determine what was the potential reason for the lack of effectiveness of supplementation. The most popular ones include:
- excess arginine in the diet – an eight-year study involving 12 people proved that reducing L-arginine intake combined with L-lysine supplementation yielded the best results; during the study, one participant noted a decrease in the effectiveness of L-lysine supplementation after consuming peanuts, which are a food rich in L-arginine; however, discontinuing this product and continuing supplementation again reduced the frequency of herpes formation,
- too short supplementation – supplementation at the time of herpes development (from a few to several days) did not yield therapeutic effects; studies in which participants noted a decrease in frequency or a milder course of herpes recurrences usually lasted from several months to several years,
- too low a dose – in studies using a dose of 200 mg of L-lysine, patients did not report a significant reduction in recurrence frequency compared to the placebo group. Current data suggest that a dose of 400-500 mg, such as in BestProtect, is an optimal dose for prophylactic use during viral remission.
Is lysine safe? Possible side effects
According to the current state of knowledge, L-lysine is a well-tolerated supplement, and studies in which daily doses ranged from 700 to 3000 mg (3g) did not report side effects from its use. Problems such as:
- abdominal pain combined with cramps,
- nausea,
- diarrhea,
were reported at doses between 10 and 15 g per day. However, this is a dose many times higher than those showing a positive effect on HSV infection. Nevertheless, before introducing L-lysine into the diet as a preventive measure, it is advisable to consult a doctor, especially in the case of:
- kidney disease – because lysine is primarily metabolized and excreted by the kidneys, large doses can burden this organ. People with chronic kidney disease should consult their doctor about supplementation.
- pregnancy and breastfeeding – there is insufficient research on the safety of high-dose lysine supplementation during this period, therefore caution is recommended or only using doses recommended in the diet.
- taking specialized medications for chronic diseases or antibiotics – lysine in large doses may interact with certain medications, e.g., diuretics or certain antibiotics.
- diagnosed allergy to chicken protein or allergy to specific amino acids.
Sources:
- R. S. Griffith, D. E. Walsh, K. H.Myrmel, R. W.Thompson et al. Success of L-lysine therapy in frequently recurrent herpes simplex infection. Treatment and prophylaxis, Dermatologica, no. 175, issue 4
- M. C. Pedrazini, M. H. da Silva, F. C. Groppo, L-lysine: Its antagonism with L-arginine in controlling viral infection. Narrative literature review, British Journal of Clinical Pharmacology, no. 88/2022, issue 11.
- M.C. Pedrazini, V.C. Araújo, V.A.M. Montalli, The effect of L-Lysine in recurrent herpes labialis: pilot study with a 8-year follow up, Revista Gaúcha de Odontologia, no. 66/2018, issue 3
- M.Singh, S. Pande, D.M. Rai et al., Medicinal Uses of L-Lysine: Past and Future, International Journal of Research in Pharmaceutical Sciences, no. 2/2011, issue 4.