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Allicin

antimicrobial properties, active compound in garlic

Evidence · Grade B
Interaction risk

Allicin is a sulfur compound formed from crushed garlic, known for its antimicrobial properties and being the primary active component of garlic.

Last reviewed June 5, 2026 · AI-assisted, human-reviewed
Allicin, derived from garlic, is a sulfur-containing compound with potent antimicrobial properties. It is often investigated as a natural alternative or complementary treatment for Small Intestinal Bacterial Overgrowth (SIBO) due to its broad-spectrum activity against various microorganisms.

Quick answer

What it is: Allicin, derived from garlic, is a sulfur-containing compound with potent antimicrobial properties.

May support:SIBO

Evidence:Evidence · Grade B

Evidence Summary

Evidence · Grade B

The current evidence for allicin's efficacy in specific conditions, such as SIBO, is limited due to a lack of human clinical trials. Much of the understanding of allicin's mechanisms and potential benefits comes from in vitro studies and animal models, which do not directly translate to human outcomes.

Last reviewed · Jun 2026

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Why It Works

Allicin exerts its antimicrobial effects by reacting with thiol groups in proteins, disrupting essential enzyme function in bacteria. This interference leads to irreversible inhibition of key metabolic processes, ultimately causing bacterial cell death or growth inhibition without significantly impacting beneficial gut flora in the same manner as some antibiotics.

How it works in more detail

Allicin's primary mechanism involves its rapid reaction with sulfhydryl (thiol) groups of various proteins and enzymes, particularly those essential for microbial survival and replication. This thiosulfinate structure allows it to undergo thiol-disulfide exchange reactions, forming mixed disulfides with cysteine residues in target proteins. In bacteria, this can inhibit key metabolic enzymes, DNA and RNA synthesis, and cell wall formation. In fungi, it may disrupt membrane integrity and enzyme activity. Allicin also exhibits antioxidant activity by scavenging free radicals and modulating cellular redox status, potentially influencing inflammatory pathways.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
Standardized allicin extracts are often dosed at 450 mg 2-3 times per day, typically providing 5-10 mg of active allicin, for 4-6 weeks.
Typical forms
capsule, tablet
Medication interactions
  • anticoagulants
  • antiplatelet drugs
Avoid if
  • bleeding disorders
  • prior to surgery

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Suggested dosage

Standardized allicin extracts are often dosed at 450 mg 2-3 times per day, typically providing 5-10 mg of active allicin, for 4-6 weeks.

General guidance — discuss specifics with a clinician.

Safety

Safety warnings

Common side effects may include garlic breath, body odor, and gastrointestinal upset (e.g., heartburn, nausea, diarrhea), especially at higher doses. It may also increase the risk of bleeding in some individuals due to antiplatelet effects.

Avoid if

  • bleeding disorders
  • prior to surgery

Medication interactions

  • anticoagulants
  • antiplatelet drugs

Reported side effects

  • gastrointestinal upset
  • heartburn
  • nausea
  • diarrhea
  • garlic odor on breath or skin

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

No indexed evidence yet. We're still building out this remedy's evidence ecosystem.

Limitations: A significant limitation is the absence of human clinical trials specifically investigating allicin for SIBO. Existing research is primarily preclinical (in vitro, animal studies) and focuses on general antimicrobial effects, not targeted SIBO treatment. The instability of allicin and variability in supplement formulations also pose challenges for consistent research.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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