Ingredient review
Tetradecyloctadecanoic Acid
INCI: TETRADECYLOCTADECANOIC ACID
A gentle, synthetic fatty acid that softens and smooths skin with a very low risk of irritation or clogged pores.
In plain English
Tetradecyloctadecanoic acid is a man-made fatty acid that feels silky on the skin. It helps moisturize by forming a light, breathable film that reduces water loss and leaves skin feeling soft and smooth. Because it’s a larger molecule, it sits on the surface rather than penetrating deeply, making it very unlikely to cause breakouts or irritation.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Tetradecyloctadecanoic Acid is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Tetradecyloctadecanoic Acid.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A synthetic branched-chain fatty acid with 32 carbon atoms, produced in a lab to mimic the skin-friendly properties of natural fatty acids. It is a waxy, solid ingredient that melts at skin temperature.
How it works
It acts as an emollient by filling in the gaps between skin cells, smoothing the skin’s surface and reducing roughness. It also forms a thin, non-greasy barrier that slows water evaporation (transepidermal water loss, or TEWL), helping to keep skin hydrated.
Pros
Gentle on sensitive skin
Tetradecyloctadecanoic acid has a very low irritation risk, making it a safe choice for people with reactive or easily irritated skin.
Non-greasy hydration
Unlike heavier oils, this fatty acid provides a silky, lightweight feel that doesn’t leave a sticky or oily residue, ideal for daytime use.
Cons and cautions
Synthetic origin
It is lab-made rather than plant-derived, which may be a drawback for consumers who prioritize natural or organic ingredients.
Less research than common alternatives
Compared to widely studied fatty acids like stearic acid, there is less published research on this specific ingredient’s long-term skin effects.
Best for
- Anyone with dry or rough skin looking for a gentle emollient
- People with sensitive or acne-prone skin who want a non-comedogenic moisturizer
Use caution if
- Those who strictly avoid synthetic ingredients in their skincare
Usage tips
Safety summary
Tetradecyloctadecanoic acid is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, and no significant safety concerns have been reported in available research or regulatory reviews.
Research notes
While not as extensively studied as some common fatty acids, existing safety assessments and industry experience support its use as a gentle emollient. Most evidence comes from analog studies of similar branched-chain fatty acids and general cosmetic safety data.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions. The Cosmetic Ingredient Review (CIR) panel has evaluated similar branched-chain fatty acids and found them safe at typical use levels.
- Common uses
- Moisturizers, Anti-aging creams, Lip products, Hair conditioners
- Environmental note
- As a synthetic ingredient, its production involves chemical synthesis, which may have a higher environmental footprint than some plant-derived alternatives. However, it is not known to be bioaccumulative or toxic to aquatic life.
Good to know
- Branched-chain fatty acids like this one are often used in high-end cosmetics for their elegant, silky feel.
- It is considered a safe ingredient by major cosmetic safety panels, including the Cosmetic Ingredient Review (CIR) panel.
Common questions
What is Tetradecyloctadecanoic Acid in beauty products?
Tetradecyloctadecanoic acid is a man-made fatty acid that feels silky on the skin. It helps moisturize by forming a light, breathable film that reduces water loss and leaves skin feeling soft and smooth. Because it’s a larger molecule, it sits on the surface rather than penetrating deeply, making it very unlikely to cause breakouts or irritation.
What does Tetradecyloctadecanoic Acid do in a beauty product?
It acts as an emollient by filling in the gaps between skin cells, smoothing the skin’s surface and reducing roughness. It also forms a thin, non-greasy barrier that slows water evaporation (transepidermal water loss, or TEWL), helping to keep skin hydrated.
Is Tetradecyloctadecanoic Acid safe for most people?
Tetradecyloctadecanoic acid is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, and no significant safety concerns have been reported in available research or regulatory reviews.
Who should be careful with Tetradecyloctadecanoic Acid?
Those who strictly avoid synthetic ingredients in their skincare
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.