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Caprylic Acid

potential antimicrobial properties

supplement
Traditional useNeeds more research

Medium-chain fatty acid with antifungal activity.

Caprylic acid, also known as octanoic acid, is a medium-chain fatty acid (MCFA) naturally found in certain oils, such as coconut oil and palm kernel oil, as well as in human breast milk. It is a saturated fatty acid with an eight-carbon chain. Due to its unique chemical structure, caprylic acid has been explored for various potential applications, particularly in relation to its antimicrobial properties. It is often used in dietary supplements and in some industrial applications.

Quick answer

What it is: Caprylic acid, also known as octanoic acid, is a medium-chain fatty acid (MCFA) naturally found in certain oils, such as coconut oil and palm kernel oil, as well as in human breast milk.

May support:SIBO

Evidence Summary

The current understanding of caprylic acid's effects is largely based on in vitro studies and some animal research. There is a notable absence of robust human clinical trials to definitively establish its efficacy for specific health conditions. Therefore, claims regarding its benefits should be interpreted with caution.

Last reviewed · Jun 2026

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Why It Works

Disrupts Candida cell membranes.

How it works in more detail

The antimicrobial action of caprylic acid is primarily attributed to its ability to integrate into and disrupt the integrity of microbial cell membranes. This disruption can lead to increased permeability, leakage of intracellular components, and ultimately, cell lysis. This mechanism is thought to be effective against certain bacteria and fungi. The specific targets and pathways can vary depending on the microorganism.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
500–1000 mg with meals
Research dosage range
Research dosages vary widely depending on the study design and target organism, often using concentrations or amounts that are not directly comparable to human oral supplementation.
Typical forms
Capsule, Softgel, Liquid oil
Quality markers
When purchasing caprylic acid supplements, look for products from reputable manufacturers that provide third-party testing for purity and potency. Check for clear labeling of the caprylic acid content and the source (e.g., coconut oil).

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Suggested dosage

500–1000 mg with meals

General guidance — discuss specifics with a clinician.

Active medicinal compounds

Caprylic acid (octanoic acid)

Traditional use

While caprylic acid itself is a chemical compound, its natural sources like coconut oil have a long history of traditional use in various cultures for both culinary and medicinal purposes. These traditional uses often involve the consumption of the whole oil rather than isolated caprylic acid.

Safety

Safety warnings

Mild GI upset; Herxheimer reactions.

Reported side effects

  • Nausea
  • Stomach upset
  • Diarrhea

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 lack of human clinical trials to validate the findings from in vitro and animal studies. The concentrations and forms of caprylic acid used in laboratory settings may not directly translate to physiological conditions or typical dietary intake. Furthermore, research often focuses on isolated caprylic acid, which may not reflect the effects of whole food sources.

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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