We conducted a double-blind, placebo-controlled clinical trial to explore the effectiveness of a zinc oxide/glycine cream in treating cold sores caused by facial and circumoral herpes. By dividing 46 participants into two groups, one receiving the zinc treatment and the other a placebo, we aimed to measure how this formulation affected the duration and severity of cold sore symptoms.
Our results were quite promising! Participants who began using the zinc oxide/glycine cream within the first 24 hours of noticing symptoms experienced cold sore lesions that lasted only an average of 5 days, compared to 6.5 days for those on the placebo. Additionally, we noticed a significant reduction in the overall severity of their symptoms, including blistering, soreness, itching, and tingling.
As for side effects, subjects treated with the zinc cream experienced only minor and reversible issues typical of ionic zinc salt solutions. This indicates that the zinc oxide/glycine cream is not only effective but also safe for treating cold sores, presenting a valuable option for many people seeking relief from this common condition.
Read More
9
Zinc gel aids cold sore healing
[Clinical double-blind trial of topical zinc sulfate for herpes labialis recidivans].
We conducted a double-blind, placebo-controlled clinical trial to assess the impact of zinc sulfate gel on cold sores, specifically herpes labialis recidivans. In our study, patients treated with zinc sulfate gel, known as Virudermin Gel, experienced significantly reduced symptoms and faster healing compared to those who received just the gel without zinc.
The results were promising; the patients using the zinc gel reported less discomfort, and their sores healed more quickly. Importantly, this treatment showed no significant side effects, making it a safe option for managing cold sores. Additionally, the antiseptic properties of zinc sulfate helped prevent any superinfections, adding another layer of benefit to its use.
Overall, our exploration into zinc’s effectiveness provided valuable insights for both patients and healthcare providers seeking reliable cold sore treatment options. With simple application and proven results, zinc sulfate gel could become a go-to remedy for those frequently struggling with herpes labialis recidivans.
Read More
8
Zinc treatment helps cold sores
Recurrent herpes labialis: a pilot study of the efficacy of zinc therapy.
We aimed to understand how zinc might affect the occurrence and duration of cold sores, also known as herpes labialis. In our study, we treated 20 patients, mostly women with an average age of 26.6, who experienced more than six episodes of cold sores each year. They received zinc sulphate at a dose of 22.5 mg twice daily during specific months over a year while we monitored their symptoms for 12 months.
Our results were promising. Patients reported a decrease in the frequency of cold sore episodes, averaging fewer than four instances per year. Moreover, the duration of these episodes was also shortened to around 5.7 days, significantly less than usual for these conditions.
Thus, we can say that systemic zinc sulphate seemed to effectively reduce both the number of cold sore outbreaks and the recovery time. This suggests that zinc might be a beneficial option for individuals who struggle with recurrent cold sores.
Read More
Most Useful Reviews
8
Improved male health
14 people found this helpful
Helped me with a cold, and my boyfriend is thrilled with the result – these are excellent male vitamins. This Zinc delivers a good effect and helped him overcome a cold in two days. He noticed a significant difference after just five days, stating that men should monitor their zinc levels. However, we did notice some tingling in his side after taking it for five consecutive days, which we are monitoring. Overall, these vitamins are highly commendable.
Read More
7
Reduced acne sores
8 people found this helpful
Bought on my cosmetologist's recommendation to enhance my facial skin. Zinc genuinely makes a difference; internal cold sores are significantly fewer, and my complexion has improved. Additionally, all the sores that emerged from my weakened immunity have cleared up, which was quite surprising!
Read More
2
No effect noted
2 people found this helpful
I took this zinc to strengthen my immunity during the cold season. The tablets are small, white, tasteless, and easy to swallow. I took one tablet daily after meals to avoid nausea. Unfortunately, after consuming half the can, I came down with a fever. I preferred zinc from a different brand, which provided better results for combating cold sores.
We explored the connection between zinc levels and recurrent herpes labialis (RHL), commonly known as cold sores. In a study involving 80 individuals, we compared the salivary zinc levels of healthy people with those experiencing RHL during both the acute and convalescent phases.
The findings revealed that patients in the acute phase had significantly lower zinc levels (160.8 ng/ml) compared to when they were recovering (205.7 ng/ml). Both those phases showed lower zinc levels than the healthy individuals' average. This suggests that zinc levels are not just lower when cold sores are present, but also improve after the lesions heal.
Our results indicate that maintaining adequate zinc levels might be beneficial for people suffering from cold sores. Incorporating zinc supplements could play a role in both treating and preventing these uncomfortable outbreaks. We found that increasing serum zinc might help RHL patients, shedding light on a potential supportive treatment strategy for cold sores.
Read More
9
Zinc may relieve cold sores
Safety and effectiveness of an L-lysine, zinc, and herbal-based product on the treatment of facial and circumoral herpes.
We conducted a small pilot study to investigate how a combination of L-lysine, zinc, and herbal ingredients could help treat cold sores caused by the Herpes simplex virus. Our goal was to observe the changes in symptoms such as itching, burning, and soreness among participants over the course of treatment.
Thirty individuals, split evenly between genders, participated in our open-label study. We monitored their symptoms through various methods, including self-reported outcomes, photographs, and daily diaries. By the sixth day of treatment, most participants showed considerable improvement, with some experiencing full resolution of their symptoms.
While we didn't isolate the effect of zinc alone, its inclusion in the treatment mix seems promising. By the end of our study, we found that 87 percent of participants had improved symptomatically, which indicates that the combination treatment may effectively relieve cold sore symptoms. Importantly, no adverse effects were reported during the study, which adds to our understanding of these treatments' safety.
Read More
9
Zinc cream alleviates cold sores
A randomized clinical trial on the treatment of oral herpes with topical zinc oxide/glycine.
We conducted a double-blind, placebo-controlled clinical trial to explore the effectiveness of a zinc oxide/glycine cream in treating cold sores caused by facial and circumoral herpes. By dividing 46 participants into two groups, one receiving the zinc treatment and the other a placebo, we aimed to measure how this formulation affected the duration and severity of cold sore symptoms.
Our results were quite promising! Participants who began using the zinc oxide/glycine cream within the first 24 hours of noticing symptoms experienced cold sore lesions that lasted only an average of 5 days, compared to 6.5 days for those on the placebo. Additionally, we noticed a significant reduction in the overall severity of their symptoms, including blistering, soreness, itching, and tingling.
As for side effects, subjects treated with the zinc cream experienced only minor and reversible issues typical of ionic zinc salt solutions. This indicates that the zinc oxide/glycine cream is not only effective but also safe for treating cold sores, presenting a valuable option for many people seeking relief from this common condition.
Read More
9
Zinc gel aids cold sore healing
[Clinical double-blind trial of topical zinc sulfate for herpes labialis recidivans].
We conducted a double-blind, placebo-controlled clinical trial to assess the impact of zinc sulfate gel on cold sores, specifically herpes labialis recidivans. In our study, patients treated with zinc sulfate gel, known as Virudermin Gel, experienced significantly reduced symptoms and faster healing compared to those who received just the gel without zinc.
The results were promising; the patients using the zinc gel reported less discomfort, and their sores healed more quickly. Importantly, this treatment showed no significant side effects, making it a safe option for managing cold sores. Additionally, the antiseptic properties of zinc sulfate helped prevent any superinfections, adding another layer of benefit to its use.
Overall, our exploration into zinc’s effectiveness provided valuable insights for both patients and healthcare providers seeking reliable cold sore treatment options. With simple application and proven results, zinc sulfate gel could become a go-to remedy for those frequently struggling with herpes labialis recidivans.
Read More
8
Pomegranate extract reduces inflammation
Anti-inflammatory activity of Punica granatum L. (Pomegranate) rind extracts applied topically to ex vivo skin.
We examined how the combination of pomegranate rind extract (PRE) and zinc impacts cold sores, particularly focusing on inflammation. By applying these substances to ex vivo porcine skin, we were able to assess their ability to modulate COX-2, a key player in the inflammation process.
Our findings revealed that the topical application of PRE significantly reduced COX-2 levels in the skin after just six hours and maintained this effect for 24 hours. When we combined PRE with zinc, the results matched those of PRE alone, indicating that zinc didn't add extra benefits to inflammation control when used together.
However, we also noted that zinc alone showed no significant anti-inflammatory effect, highlighting that the benefits we observed were primarily due to the pomegranate extract rather than zinc. This suggests that while zinc is commonly thought beneficial for treating cold sores, its impact on inflammation might be limited unless paired with more potent anti-inflammatory agents like PRE.
In conclusion, pomegranates present a promising approach to managing inflammation and pain associated with cold sores, but zinc’s standalone effectiveness requires reconsideration.
Helped me with a cold, and my boyfriend is thrilled with the result – these are excellent male vitamins. This Zinc delivers a good effect and helped him overcome a cold in two days. He noticed a significant difference after just five days, stating that men should monitor their zinc levels. However, we did notice some tingling in his side after taking it for five consecutive days, which we are monitoring. Overall, these vitamins are highly commendable.
Read More
7
Reduced acne sores
8 people found this helpful
Bought on my cosmetologist's recommendation to enhance my facial skin. Zinc genuinely makes a difference; internal cold sores are significantly fewer, and my complexion has improved. Additionally, all the sores that emerged from my weakened immunity have cleared up, which was quite surprising!
Read More
2
No effect noted
2 people found this helpful
I took this zinc to strengthen my immunity during the cold season. The tablets are small, white, tasteless, and easy to swallow. I took one tablet daily after meals to avoid nausea. Unfortunately, after consuming half the can, I came down with a fever. I preferred zinc from a different brand, which provided better results for combating cold sores.
Read More
Frequently Asked Questions
Cold sores, also known as fever blisters, are small, fluid-filled blisters that typically appear on or around the lips, although they can also occur in other areas of the face. They are caused by the herpes simplex virus (HSV), primarily HSV-1, and are highly contagious. The initial outbreak may be accompanied by symptoms such as fever, swollen lymph nodes, and a general feeling of malaise. Once infected, the virus remains dormant in the body and can reactivate, leading to recurring outbreaks, often triggered by stress, illness, or exposure to sunlight.
Treatment options for cold sores often focus on alleviating symptoms and speeding up healing. Over-the-counter creams containing antiviral medication like docosanol can help reduce the duration of an outbreak when applied early on. Prescription medications may be recommended for more severe cases. Home remedies, such as applying ice, using aloe vera, or taking lysine supplements, may also offer some relief. Prevention strategies include avoiding known triggers and practicing good hygiene, like not sharing utensils or personal items with infected individuals.
Zinc is a versatile metal known for its various applications in industry and health. It is a bluish-white metallic element represented by the symbol Zn and atomic number 30 on the periodic table. Zinc is primarily used for galvanizing steel to prevent rusting, in the manufacturing of alloys, and as a component in batteries. Additionally, zinc plays a crucial role in biological processes, making it an essential trace element in the human diet. It is involved in immune function, protein synthesis, wound healing, and DNA synthesis, highlighting its importance in maintaining overall health and well-being.
Zinc is often touted as a potential remedy for cold sores, primarily due to its immune-boosting properties and its role in skin health. Research suggests that zinc may help reduce the severity and duration of cold sore outbreaks, as it can inhibit the replication of the herpes simplex virus, the virus responsible for cold sores. It is available in various forms, including topical ointments and oral supplements. When applied directly to the affected area, zinc oxide or zinc sulfate creams may help soothe the skin and promote healing.
However, it's important to note that while zinc may aid in managing cold sores, it is not a cure. Results can vary from person to person, and some may find topical treatments to be more effective than others. Always consult a healthcare professional before starting any new treatment regimen, as they can provide guidance tailored to your specific situation. Additionally, maintaining a healthy lifestyle, including proper nutrition and stress management, can further support your immune system in preventing and managing outbreaks effectively.
Based on user reviews, the time it takes to see results from taking zinc supplements for cold sores can vary. One user noted that they saw a significant difference after two days, particularly in aiding recovery from a cold, which may correlate with the healing process of cold sores Read Review. Another reviewer experienced a reduction in internal cold sores and improved complexion, attributing these benefits to zinc over a longer duration of use, although the specific timeframe was not detailed Read Review.
It's important to consider that individual responses can vary significantly based on overall health and the particular zinc formulation used. One user reported mixed results, expressing a preference for a different brand that seemed to perform better in combating cold sores Read Review. Therefore, while some users might notice improvements within a few days, others may require consistent use over a longer period for effective results.
Research regarding zinc supplementation for cold sores presents a mixed, yet promising picture. One study indicated that lower serum zinc levels were associated with longer recovery times for cold sores, suggesting that zinc may play a role in faster recovery, albeit not as a significant influencer of relapse frequency [1]. Additionally, another investigation highlighted that topical application of zinc might help reduce the duration and severity of cold sore symptoms when combined with treatments like zinc oxide or zinc sulfate, although the benefits were modest when used alone [4].
Multiple studies consistently support the idea that maintaining adequate zinc levels could aid in managing cold sores. For instance, a clinical trial reported benefits from zinc oxide/glycine cream, showing reduced lesion duration and severity in participants who began treatment swiftly [7]. In another study, patients using zinc sulfate gel experienced quicker healing times without significant side effects, further affirming zinc's potential efficacy [8]. Consequently, while zinc may not be a standalone solution, it appears to be a beneficial adjunct in the comprehensive management of cold sores.
Users have reported a range of positive improvements in symptoms relating to the use of zinc supplements. For instance, one user noted a significant enhancement in recovery from a cold, with effects typically seen within just two days, leading to a notable difference in their overall condition after five days Read Review. Another reviewer highlighted benefits specifically for skin health, experiencing fewer internal cold sores and an unexpected improvement in complexion after using zinc as recommended by a cosmetologist Read Review.
However, it's crucial to remember that individual experiences can vary considerably. One reviewer shared that despite their expectations for immune support, they faced a fever and found better results with a different zinc brand in combating cold sores Read Review. As with any supplement, the effectiveness may be influenced by personal health factors and the specific formulation used.
Users have reported mixed results when combining this zinc supplement with other treatments for cold sores. One user noted significant improvements in their skin and a reduction in internal cold sores, attributing these benefits to zinc and highlighting an unexpected improvement in complexion after following their cosmetologist's advice Read Review. This suggests that zinc may enhance the efficacy of other skin-care regimes or supplements aimed at healing from cold sores.
Conversely, another reviewer shared a negative experience, discussing how despite their intention to boost immunity through zinc, they ultimately experienced adverse effects, such as a fever, and found a different brand more effective for cold sore management Read Review. This feedback implies that while some users see benefits from combining zinc with their routines, others may need to experiment with different formulations or brands to achieve optimal results.
The research indicates that zinc can be beneficial in the treatment of cold sores, with certain doses showing promising outcomes. A study found that administering zinc sulfate at a dose of 22.5 mg twice daily led to a decrease in the frequency and duration of cold sore episodes, averaging around 5.7 days per outbreak, which is significantly shorter than typical durations for patients experiencing multiple outbreaks annually [5]. Additionally, topical applications using zinc oxide have shown effectiveness when started within 24 hours of symptom onset, resulting in a reduction of lesion duration from 6.5 to 5 days [7].
Furthermore, the use of low concentrations of zinc sulfate (0.025-0.05% for skin application) has also been explored for both preventing and treating outbreaks, suggesting a strong potential for topical zinc treatments [9]. While oral supplementation could play a role in managing symptoms, combining zinc with more potent anti-inflammatory agents like pomegranate extract has provided more notable benefits [2]. This highlights that while zinc supplementation, particularly in specific doses or concentrations, shows promise for treating cold sores, its overall efficacy is best achieved when integrated into a broader treatment approach.
8
Improved male health
14 people found this helpful
Helped me with a cold, and my boyfriend is thrilled with the result – these are excellent male vitamins. This Zinc delivers a good effect and helped him overcome a cold in two days. He noticed a significant difference after just five days, stating that men should monitor their zinc levels. However, we did notice some tingling in his side after taking it for five consecutive days, which we are monitoring. Overall, these vitamins are highly commendable.
7
Reduced acne sores
8 people found this helpful
Bought on my cosmetologist's recommendation to enhance my facial skin. Zinc genuinely makes a difference; internal cold sores are significantly fewer, and my complexion has improved. Additionally, all the sores that emerged from my weakened immunity have cleared up, which was quite surprising!
2
No effect noted
2 people found this helpful
I took this zinc to strengthen my immunity during the cold season. The tablets are small, white, tasteless, and easy to swallow. I took one tablet daily after meals to avoid nausea. Unfortunately, after consuming half the can, I came down with a fever. I preferred zinc from a different brand, which provided better results for combating cold sores.
7
Zinc and cold sore recovery
Comparative study of serum zinc concentration in recurrent herpes labialis patients and healthy individuals.
We explored the relationship between zinc levels and recurrent herpes labialis (cold sores) through a study involving 43 patients with a history of this condition and 42 healthy individuals. By measuring serum zinc levels using a colorimetric method, we aimed to find out whether these levels differ significantly between both groups and how they relate to the severity and duration of cold sore episodes.
Although we found that serum zinc levels did not significantly differ between the patients and healthy subjects, we observed an interesting correlation regarding recovery times. Specifically, lower serum zinc levels appeared to be linked to longer recovery periods from cold sores. This suggests that zinc might play a role in speeding up recovery, though it was not a significant factor influencing relapse frequency or patient demographics such as age and sex.
Overall, while the study didn’t establish a direct benefit of zinc supplementation, the findings indicate that zinc deficiency might contribute to longer-lasting cold sores. Therefore, we suggest that evaluating zinc levels in patients experiencing recurrent cold sores could be beneficial and that zinc supplementation may be worth considering in treatment protocols.
We explored the effectiveness of zinc treatments for cold sores, often caused by the herpes simplex virus. The research indicates that using zinc oxide or zinc sulfate, along with other interventions such as anesthetic or antiviral creams, can lead to a slight reduction in the duration of symptoms when applied promptly. However, its benefits appear small and may not outweigh other treatments available.
The study also highlighted the potential of oral antiviral medications in managing symptoms and preventing future outbreaks. While zinc treatment may offer some help, it is essential to understand that it is usually most effective when used alongside other therapies. As for using sunscreen to avoid triggers like sunlight, the results were mixed. In controlled settings, some protections were noted, but these weren't consistently replicated in everyday situations.
All in all, prompt treatment with either topical or oral medications is key for alleviating cold sore symptoms. We found that both approaches can help prevent future occurrences of cold sores, but we should be cautious in relying solely on zinc as a treatment option.
9
Zinc cream alleviates cold sores
A randomized clinical trial on the treatment of oral herpes with topical zinc oxide/glycine.
We conducted a double-blind, placebo-controlled clinical trial to explore the effectiveness of a zinc oxide/glycine cream in treating cold sores caused by facial and circumoral herpes. By dividing 46 participants into two groups, one receiving the zinc treatment and the other a placebo, we aimed to measure how this formulation affected the duration and severity of cold sore symptoms.
Our results were quite promising! Participants who began using the zinc oxide/glycine cream within the first 24 hours of noticing symptoms experienced cold sore lesions that lasted only an average of 5 days, compared to 6.5 days for those on the placebo. Additionally, we noticed a significant reduction in the overall severity of their symptoms, including blistering, soreness, itching, and tingling.
As for side effects, subjects treated with the zinc cream experienced only minor and reversible issues typical of ionic zinc salt solutions. This indicates that the zinc oxide/glycine cream is not only effective but also safe for treating cold sores, presenting a valuable option for many people seeking relief from this common condition.
9
Zinc gel aids cold sore healing
[Clinical double-blind trial of topical zinc sulfate for herpes labialis recidivans].
We conducted a double-blind, placebo-controlled clinical trial to assess the impact of zinc sulfate gel on cold sores, specifically herpes labialis recidivans. In our study, patients treated with zinc sulfate gel, known as Virudermin Gel, experienced significantly reduced symptoms and faster healing compared to those who received just the gel without zinc.
The results were promising; the patients using the zinc gel reported less discomfort, and their sores healed more quickly. Importantly, this treatment showed no significant side effects, making it a safe option for managing cold sores. Additionally, the antiseptic properties of zinc sulfate helped prevent any superinfections, adding another layer of benefit to its use.
Overall, our exploration into zinc’s effectiveness provided valuable insights for both patients and healthcare providers seeking reliable cold sore treatment options. With simple application and proven results, zinc sulfate gel could become a go-to remedy for those frequently struggling with herpes labialis recidivans.
8
Zinc treatment helps cold sores
Recurrent herpes labialis: a pilot study of the efficacy of zinc therapy.
We aimed to understand how zinc might affect the occurrence and duration of cold sores, also known as herpes labialis. In our study, we treated 20 patients, mostly women with an average age of 26.6, who experienced more than six episodes of cold sores each year. They received zinc sulphate at a dose of 22.5 mg twice daily during specific months over a year while we monitored their symptoms for 12 months.
Our results were promising. Patients reported a decrease in the frequency of cold sore episodes, averaging fewer than four instances per year. Moreover, the duration of these episodes was also shortened to around 5.7 days, significantly less than usual for these conditions.
Thus, we can say that systemic zinc sulphate seemed to effectively reduce both the number of cold sore outbreaks and the recovery time. This suggests that zinc might be a beneficial option for individuals who struggle with recurrent cold sores.
8
Zinc effective for cold sores
Topical treatment of recurrent herpes simplex and post-herpetic erythema multiforme with low concentrations of zinc sulphate solution.
We explored the effectiveness of low concentrations of zinc sulphate solution in managing recurrent cold sores. The study documented that applying zinc sulphate directly to the skin or oral mucous membrane showed promising results in preventing outbreaks of herpes simplex virus, which causes cold sores.
Specifically, we noted that a solution concentration of 0.025-0.05% for the skin and 0.01-0.025% for the oral area was used for treatment. Not only did this approach seem beneficial for active infections, but it also aided in stopping the recurrence of post-herpetic erythema multiforme—a condition related to past herpes outbreaks.
Overall, these findings are exciting for anyone struggling with the recurring pain and embarrassment of cold sores, as they suggest a relatively simple topical treatment could help reduce flare-ups. We believe this research paves the way for further discussions about using zinc sulphate as a viable option for managing such conditions effectively.
8
Pomegranate extract reduces inflammation
Anti-inflammatory activity of Punica granatum L. (Pomegranate) rind extracts applied topically to ex vivo skin.
We examined how the combination of pomegranate rind extract (PRE) and zinc impacts cold sores, particularly focusing on inflammation. By applying these substances to ex vivo porcine skin, we were able to assess their ability to modulate COX-2, a key player in the inflammation process.
Our findings revealed that the topical application of PRE significantly reduced COX-2 levels in the skin after just six hours and maintained this effect for 24 hours. When we combined PRE with zinc, the results matched those of PRE alone, indicating that zinc didn't add extra benefits to inflammation control when used together.
However, we also noted that zinc alone showed no significant anti-inflammatory effect, highlighting that the benefits we observed were primarily due to the pomegranate extract rather than zinc. This suggests that while zinc is commonly thought beneficial for treating cold sores, its impact on inflammation might be limited unless paired with more potent anti-inflammatory agents like PRE.
In conclusion, pomegranates present a promising approach to managing inflammation and pain associated with cold sores, but zinc’s standalone effectiveness requires reconsideration.
References
Ranjbar Z, Zahed M, Ranjbar MA, Shirmardan Z. Comparative study of serum zinc concentration in recurrent herpes labialis patients and healthy individuals. BMC Oral Health. 2020;20:296. 10.1186/s12903-020-01277-2
Houston DM, Bugert J, Denyer SP, Heard CM. Anti-inflammatory activity of Punica granatum L. (Pomegranate) rind extracts applied topically to ex vivo skin. Eur J Pharm Biopharm. 2017;112:30. 10.1016/j.ejpb.2016.11.014
Khozeimeh F, Jafari N, Attar AM, Jafari S, Ataie M. Comparative analysis of salivary zinc level in recurrent herpes labialis. Dent Res J (Isfahan). 2012;9:19. 10.4103/1735-3327.92922
Opstelten W, Neven AK, Eekhof J. Treatment and prevention of herpes labialis. Can Fam Physician. 2008;54:1683.
Femiano F, Gombos F, Scully C. Recurrent herpes labialis: a pilot study of the efficacy of zinc therapy. J Oral Pathol Med. 2005;34:423.
Singh BB, Udani J, Vinjamury SP, Der-Martirosian C, Gandhi S, et al. Safety and effectiveness of an L-lysine, zinc, and herbal-based product on the treatment of facial and circumoral herpes. Altern Med Rev. 2005;10:123.
Godfrey HR, Godfrey NJ, Godfrey JC, Riley D. A randomized clinical trial on the treatment of oral herpes with topical zinc oxide/glycine. Altern Ther Health Med. 2001;7:49.
Kneist W, Hempel B, Borelli S. [Clinical double-blind trial of topical zinc sulfate for herpes labialis recidivans]. Arzneimittelforschung. 1995;45:624.
Brody I. Topical treatment of recurrent herpes simplex and post-herpetic erythema multiforme with low concentrations of zinc sulphate solution. Br J Dermatol. 1981;104:191.