Nutrient Fact Sheets
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July 16, 2024

Can Garlic Kill H. Pylori? An Evidence-Based Analysis

Medically Reviewed by
Updated On
September 17, 2024

Helicobacter pylori (H. pylori) affects over 4.4 billion people worldwide and is implicated in many gastrointestinal diseases, such as gastric ulcers and stomach cancer. It infects the stomach lining, causing local inflammation that has the potential to progress to more serious stomach disease.Β 

This article explores common questions about the potential of garlic, known for its antibacterial properties, to kill H. pylori. It reviews scientific evidence on garlic's effectiveness, dosage recommendations, and its role alongside conventional treatments, highlighting the importance of combining natural remedies with medical guidance for optimal gastrointestinal health.

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What Is H. pylori?

H. pylori is a Gram-negative bacteria that infects the stomach lining and can lead to issues such as gastritis, peptic ulcer disease, and an increased risk of gastric cancer.Β 

H. pylori is easily transmittable, often by oral-oral and oral-fecal routes between family and close community members. It is highly prevalent, affecting over 50% of the global population, especially where proper sanitation is inaccessible. Although most carriers of H. pylori are asymptomatic, it can progress to disease if infection and resulting inflammation occur (21).Β 

The key to H. pylori's success is its ability to produce urease, a basic compound that effectively shields the bacteria against acidic degradation by raising the pH levels in its immediate environment. Its tail-like structure propels it toward the stomach lining, where it adheres and can release toxins that instigate inflammation and eventually disease (29).Β Β 

Common Symptoms of H. pylori Infection

Although most H. pylori carriers do not have symptoms, it is critical to recognize the signs of a symptomatic infection, as they often indicate disease progression that requires treatment:Β 

Conventional Treatments for H. pylori

According to the H. pylori treatment guidelines put forth by the American College of Gastroenterology, the most common first-line treatment options are as follows:

  • Clarithromycin Triple Therapy: Combined use of a proton-pump inhibitor (PPI), clarithromycin, and amoxicillin or metronidazole taken for 14 days. This option should only be used in areas where clarithromycin antibiotic resistance is less than 15%.Β 
  • Bismuth Quadruple Therapy: Combined use of a PPI, bismuth salts, tetracycline, and nitroimidazole taken for 10-14 days.Β 
  • Concomitant Therapy: Combined use of a PPI, clarithromycin, amoxicillin, and nitroimidazole taken for 10-14 days.Β 

The goal of treatment is to eradicate H. pylori and prevent reinfection. Therefore, treatment adherence for the full duration is essential to ensure successful eradication.Β 

What Does the Evidence Say About Garlic and H. pylori?

Garlic's Antibacterial Properties

Garlic and other alliums have long been used medicinally across many cultures, especially as a treatment against infectious diseases. The key to garlic's antimicrobial properties lies in one of its compounds, allicin, a sulfur-rich constituent that exerts antibacterial action against both Gram-positive and Gram-negative bacteria.Β 

Allicin is released by chopping, chewing, or crushing raw garlic and is further metabolized after ingestion into other medicinally acting sulfuric compounds. Allicin works by modifying bacterial proteins and inactivating enzymes needed for bacterial survival. It also inhibits the formation of antibiotic-resistant biofilms, increasing antibiotic efficacy against infections (26).Β 

Garlic's therapeutic effects extend far beyond fighting infections. Garlic consumption is positively associated with:

Studies on Garlic and H. pylori

Interest in using garlic to treat H. pylori started when epidemiological studies demonstrated an inverse correlation between garlic consumption and gastric cancer, a disease associated with H. pylori. Due to its broad-spectrum antibiotic actions and allicin's ability to remain potent in stomach acid, garlic is poised as a potential treatment option for H. pylori infections (28).Β 

Garlic has been shown to inhibit the growth of H. pylori at the equivalent dose of 1 medium-sized garlic clove per day. These bacteriostatic actions against H. pylori are attributed primarily to allicin, with one standard garlic clove producing 7.5-13 mg of the powerful compound (23).Β 

Does Garlic Kill H. pylori?

One small study demonstrated the ability of raw garlic dosed at 2 cloves twice daily over 3 days to reduce urease levels on a breath test, indicating active H. pylori-reducing potential. However, these results are harder to replicate in larger studies, and the results are often mixed and even contradictory when considering garlic's ability to eradicate H. pylori infection.Β 

However, some studies show promise, mainly when garlic is used as an adjunct with conventional treatment protocols rather than a stand-alone treatment. Combined with clarithromycin triple therapy, allicin raised total H. pylori eradication rates from 67% to 90%. When used as a monotherapy, allicin consumption of 1200 mg daily for 14 days resulted in eradication in 23% of participants.Β 

A meta-analysis found that the addition of allicin led to significant increases in H. pylori eradication and significantly higher rates of gastric ulcer healing post-therapy compared to conventional treatment alone. Although more research is warranted, these studies suggest that garlic can be a helpful adjunct to conventional treatment options.Β 

How Much Garlic Should You Take for H. pylori?

Recommendations for Garlic Consumption

Due to the lack of consistent dosing in research studies, a standard dose recommendation for the use of garlic in the treatment of H. pylori is yet to be established.Β 

However, some studies have demonstrated positive eradication outcomes when used adjunctively, so a dose of 1-2 garlic cloves twice daily may be an appropriate starting point.Β 

Supplementation is also an option. When prepared properly, both garlic powder capsules and garlic oil show allicin activity. Standard garlic capsule dosing ranges from 600 mg to 2400 mg per day.Β Β 

Risks and Side Effects of Garlic

As with any medicinal treatment, caution should be taken to avoid unwanted side effects and complications. Although garlic is generally safe, it can have a mild blood-thinning effect when taken in high amounts and thus may not be appropriate for those on blood thinners.Β 

Additionally, some individuals may experience gastrointestinal upset or odorous breath from raw garlic intake.Β 

Consult with a healthcare provider before using garlic to treat H. pylori to reduce potential drug-herb interactions, avoid unwanted side effects, and ensure efficacy and overall safety.Β 

Other Natural Treatments for H. pylori

Besides garlic, other natural therapies have shown promise to help treat H. pylori infections.Β 

  • Probiotics containing Lactobacillus species have demonstrated direct anti-H. pylori action and positive effects on mucosal and antibody responses within the gut. When used alongside conventional therapies, probiotics increase efficacy rates and reduce antibiotic-associated side effects such as diarrhea.Β 
  • Green tea contains catechins, a polyphenol that has been shown to reduce H. pylori's urease production and inflammatory activity, which could otherwise lead to more serious disease. Green tea can also be used preventively, as individuals who drink green tea regularly have been shown to have lower incidences of H. pylori infection.Β 
  • Honey has demonstrated the ability to kill H. pylori and prevent its pro-inflammatory processes, which are associated with gastric diseases.Β Β 

When to Use Natural Treatments

As the research demonstrates, natural treatments are best utilized with conventional H. pylori therapies, helping to increase eradication rates, reduce associated inflammation, and reduce side effects.Β 

These therapies are much less effective as stand-alone treatments and carry the risk of inadequate eradication and treatment failure.Β 

Following Doctor Instructions for Treatment

Because incomplete eradication of H. pylori can quickly lead to reinfection and associated risks, treatment protocols must be followed diligently. Regular monitoring and post-treatment testing using breath or stool tests are recommended to ensure treatment success.Β 

Thus, collaboration with a healthcare provider is necessary to decide on the best and most appropriate treatment options that can be used safely and for long enough durations to eliminate H. pylori infections.Β 

As symptomatic H. pylori is associated with severe gastric diseases such as peptic ulcer disease, gastritis, and gastric cancer, self-treatment is not recommended.Β 

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Key Takeaways

  • Garlic has shown potential in inhibiting H. pylori growth due to its antibacterial compound, allicin.Β 
  • Studies indicate it can be an effective adjunct to conventional therapies, enhancing eradication rates and reducing gastric inflammation.Β 
  • Relying solely on garlic is not advisable due to inconsistent results.Β 
  • Conventional treatments remain essential for effective H. pylori management, and medical supervision ensures proper dosage and reduces risks.Β 
  • For those considering garlic as part of their treatment regimen, consulting a healthcare provider is crucial to ensure safety and efficacy, effectively addressing any concerns related to H. pylori.

Helicobacter pylori (H. pylori) affects over 4.4 billion people worldwide and is associated with many gastrointestinal issues, such as gastric ulcers and stomach cancer. It infects the stomach lining, causing local inflammation that has the potential to progress to more serious stomach conditions.Β 

This article explores common questions about the potential of garlic, known for its antibacterial properties, to support the body's defense against H. pylori. It reviews scientific evidence on garlic's potential benefits, dosage considerations, and its role alongside conventional treatments, highlighting the importance of combining natural remedies with medical guidance for optimal gastrointestinal health.

[signup]

What Is H. pylori?

H. pylori is a Gram-negative bacteria that infects the stomach lining and can lead to issues such as gastritis, peptic ulcer disease, and an increased risk of gastric cancer.Β 

H. pylori is easily transmittable, often by oral-oral and oral-fecal routes between family and close community members. It is highly prevalent, affecting over 50% of the global population, especially where proper sanitation is inaccessible. Although most carriers of H. pylori are asymptomatic, it can progress to disease if infection and resulting inflammation occur (21).Β 

The key to H. pylori's success is its ability to produce urease, a basic compound that effectively shields the bacteria against acidic degradation by raising the pH levels in its immediate environment. Its tail-like structure propels it toward the stomach lining, where it adheres and can release substances that instigate inflammation and eventually disease (29).Β Β 

Common Symptoms of H. pylori Infection

Although most H. pylori carriers do not have symptoms, it is critical to recognize the signs of a symptomatic infection, as they often indicate disease progression that requires treatment:Β 

Conventional Treatments for H. pylori

According to the H. pylori treatment guidelines put forth by the American College of Gastroenterology, the most common first-line treatment options are as follows:

  • Clarithromycin Triple Therapy: Combined use of a proton-pump inhibitor (PPI), clarithromycin, and amoxicillin or metronidazole taken for 14 days. This option should only be used in areas where clarithromycin antibiotic resistance is less than 15%.Β 
  • Bismuth Quadruple Therapy: Combined use of a PPI, bismuth salts, tetracycline, and nitroimidazole taken for 10-14 days.Β 
  • Concomitant Therapy: Combined use of a PPI, clarithromycin, amoxicillin, and nitroimidazole taken for 10-14 days.Β 

The goal of treatment is to manage H. pylori and support the prevention of reinfection. Therefore, treatment adherence for the full duration is essential to ensure successful management.Β 

What Does the Evidence Say About Garlic and H. pylori?

Garlic's Antibacterial Properties

Garlic and other alliums have long been used in various cultures, especially to support the body's defense against infectious challenges. The key to garlic's potential antimicrobial properties lies in one of its compounds, allicin, a sulfur-rich constituent that may exert antibacterial action against both Gram-positive and Gram-negative bacteria.Β 

Allicin is released by chopping, chewing, or crushing raw garlic and is further metabolized after ingestion into other compounds. Allicin works by modifying bacterial proteins and inactivating enzymes needed for bacterial survival. It also inhibits the formation of antibiotic-resistant biofilms, potentially increasing antibiotic efficacy against infections (26).Β 

Garlic's potential effects extend beyond supporting the body's defense against infections. Garlic consumption is positively associated with:

Studies on Garlic and H. pylori

Interest in using garlic to support the body's defense against H. pylori started when epidemiological studies demonstrated an inverse correlation between garlic consumption and gastric cancer, a condition associated with H. pylori. Due to its broad-spectrum antibiotic actions and allicin's ability to remain potent in stomach acid, garlic is considered a potential option for supporting the body's defense against H. pylori infections (28).Β 

Garlic has been shown to inhibit the growth of H. pylori at the equivalent dose of 1 medium-sized garlic clove per day. These bacteriostatic actions against H. pylori are attributed primarily to allicin, with one standard garlic clove producing 7.5-13 mg of the compound (23).Β 

Does Garlic Help Manage H. pylori?

One small study demonstrated the potential of raw garlic dosed at 2 cloves twice daily over 3 days to reduce urease levels on a breath test, indicating active H. pylori-reducing potential. However, these results are harder to replicate in larger studies, and the results are often mixed and even contradictory when considering garlic's ability to manage H. pylori infection.Β 

However, some studies show promise, mainly when garlic is used as an adjunct with conventional treatment protocols rather than a stand-alone treatment. Combined with clarithromycin triple therapy, allicin raised total H. pylori management rates from 67% to 90%. When used as a monotherapy, allicin consumption of 1200 mg daily for 14 days resulted in management in 23% of participants.Β 

A meta-analysis found that the addition of allicin led to significant increases in H. pylori management and significantly higher rates of gastric ulcer healing post-therapy compared to conventional treatment alone. Although more research is warranted, these studies suggest that garlic can be a helpful adjunct to conventional treatment options.Β 

How Much Garlic Should You Consider for H. pylori?

Considerations for Garlic Consumption

Due to the lack of consistent dosing in research studies, a standard dose recommendation for the use of garlic in the management of H. pylori is yet to be established.Β 

However, some studies have demonstrated positive outcomes when used adjunctively, so a dose of 1-2 garlic cloves twice daily may be an appropriate starting point for consideration.Β 

Supplementation is also an option. When prepared properly, both garlic powder capsules and garlic oil show allicin activity. Standard garlic capsule dosing ranges from 600 mg to 2400 mg per day.Β Β 

Risks and Side Effects of Garlic

As with any dietary supplement, caution should be taken to avoid unwanted side effects and complications. Although garlic is generally safe, it can have a mild blood-thinning effect when taken in high amounts and thus may not be appropriate for those on blood thinners.Β 

Additionally, some individuals may experience gastrointestinal upset or odorous breath from raw garlic intake.Β 

Consult with a healthcare provider before using garlic to support the management of H. pylori to reduce potential drug-herb interactions, avoid unwanted side effects, and ensure efficacy and overall safety.Β 

Other Natural Options for Supporting H. pylori Management

Besides garlic, other natural therapies have shown promise to help support the management of H. pylori infections.Β 

  • Probiotics containing Lactobacillus species have demonstrated direct anti-H. pylori action and positive effects on mucosal and antibody responses within the gut. When used alongside conventional therapies, probiotics may increase efficacy rates and reduce antibiotic-associated side effects such as diarrhea.Β 
  • Green tea contains catechins, a polyphenol that has been shown to reduce H. pylori's urease production and inflammatory activity, which could otherwise lead to more serious conditions. Green tea can also be used preventively, as individuals who drink green tea regularly have been shown to have lower incidences of H. pylori infection.Β 
  • Honey has demonstrated the ability to manage H. pylori and prevent its pro-inflammatory processes, which are associated with gastric conditions.Β Β 

When to Consider Natural Options

As the research demonstrates, natural options are best utilized with conventional H. pylori therapies, helping to increase management rates, reduce associated inflammation, and reduce side effects.Β 

These therapies are much less effective as stand-alone options and carry the risk of inadequate management and treatment failure.Β 

Following Doctor Instructions for Treatment

Because incomplete management of H. pylori can quickly lead to reinfection and associated risks, treatment protocols must be followed diligently. Regular monitoring and post-treatment testing using breath or stool tests are recommended to ensure treatment success.Β 

Thus, collaboration with a healthcare provider is necessary to decide on the best and most appropriate treatment options that can be used safely and for long enough durations to manage H. pylori infections.Β 

As symptomatic H. pylori is associated with severe gastric conditions such as peptic ulcer disease, gastritis, and gastric cancer, self-treatment is not recommended.Β 

[signup]

Key Takeaways

  • Garlic has shown potential in supporting the management of H. pylori growth due to its antibacterial compound, allicin.Β 
  • Studies indicate it can be an effective adjunct to conventional therapies, enhancing management rates and reducing gastric inflammation.Β 
  • Relying solely on garlic is not advisable due to inconsistent results.Β 
  • Conventional treatments remain essential for effective H. pylori management, and medical supervision ensures proper dosage and reduces risks.Β 
  • For those considering garlic as part of their management regimen, consulting a healthcare provider is crucial to ensure safety and efficacy, effectively addressing any concerns related to H. pylori.
The information in this article is designed for educational purposes only and is not intended to be a substitute for informed medical advice or care. This information should not be used to diagnose or treat any health problems or illnesses without consulting a doctor. Consult with a health care practitioner before relying on any information in this article or on this website.

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Johns Hopkins
Educational/Medical Institution
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Hey practitioners! πŸ‘‹ Join Dr. Chris Magryta and Dr. Erik Lundquist for a comprehensive 6-week course on evaluating functional medicine labs from two perspectives: adult and pediatric. In this course, you’ll explore the convergence of lab results across different diseases and age groups, understanding how human lab values vary on a continuum influenced by age, genetics, and time. Register Here! Register Here.

Hey practitioners! πŸ‘‹ Join Dr. Terry Wahls for a 3-week bootcamp on integrating functional medicine into conventional practice, focusing on complex cases like Multiple Sclerosis. Learn to analyze labs through a functional lens, perform nutrition-focused physical exams, and develop personalized care strategies. Register Here.