Caprylic Acid
INCI: CAPRYLIC ACID
Reviewed by Daisy · Last updated 14 Aug 2026
A naturally derived fatty acid with cleansing and preservative properties
Best For Skin Types
All, Oily, Combination
Addresses
Usage Frequency
Daily
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What Is Caprylic Acid?
Caprylic acid is an eight-carbon saturated fatty acid found naturally in coconut oil, palm oil, and dairy products. In skincare formulations, it functions primarily as a surfactant and preservative agent, helping to cleanse the skin and stabilise products.
It is used in relatively small concentrations across skincare (appearing in roughly 0.3% of products) and is valued for its gentle cleansing action without the harshness of synthetic alternatives.
How It Works
As a surfactant, caprylic acid reduces the surface tension of water, allowing oil and water-based substances to mix. This enables it to lift sebum and debris from the skin surface during cleansing.
In vitro studies show antimicrobial activity against specific bacterial strains, but the concentration required and relevance to skin health in real-world conditions remains unclear. Its role in formulations is often as a supporting ingredient rather than the primary active.
Clinical Evidence & References
In vitro research demonstrates that caprylic acid and its derivatives show antimicrobial activity against certain bacteria under laboratory conditions. However, evidence specifically examining its efficacy on human skin is limited.
Most published work focuses on isolated antimicrobial effects rather than clinical skincare outcomes. The ingredient's primary cosmetic value appears to lie in its cleansing and preservative functions rather than as a targeted treatment agent.
How to Use
Caprylic acid is typically a supporting ingredient in cleansers and emulsified formulations rather than a standalone treatment. Use as directed by the product instructions, usually as part of a twice-daily cleanse. It is generally mild enough for regular use, though individual tolerance varies.
Safety & Precautions
Frequently Asked Questions
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