Ingredient review
C21-C28 Alkane
INCI: C21-C28 Alkane
A gentle, plant-derived emollient that provides a silky feel without clogging pores or causing irritation.
In plain English
C21-C28 Alkane is a mixture of natural hydrocarbons (alkanes) with chain lengths between 21 and 28 carbon atoms. It is typically derived from plant sources like sugarcane or coconut. In skincare, it acts as a lightweight emollient, meaning it softens and smooths the skin by forming a thin, breathable film that reduces water loss. Unlike heavy oils, it feels silky and non-greasy, making it popular in products that aim for a matte or velvety finish. It also helps dissolve other ingredients and improves the spreadability of formulas.
Review score
Safety, usefulness, and evidence
Strong fit for many routines
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
- natural
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Easy yes for most routines
C21-C28 Alkane 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 C21-C28 Alkane.
- 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 blend of straight-chain hydrocarbons (alkanes) with carbon chain lengths ranging from 21 to 28, typically sourced from renewable plant materials such as sugarcane or coconut oil.
How it works
When applied to the skin, C21-C28 Alkane spreads easily and forms a thin, non-occlusive film. This film helps reduce transepidermal water loss (TEWL) — the amount of water that evaporates from the skin — while allowing the skin to breathe. Its lightweight texture provides a silky, cushiony feel without leaving a greasy residue, and it can also help other active ingredients penetrate more evenly.
Pros
Lightweight and silky
C21-C28 Alkane gives products a velvety, cushiony feel without any greasiness, making it ideal for daytime use and for people with oily skin.
Low irritation potential
It is generally well-tolerated by most skin types, including sensitive skin, and has a very low risk of causing breakouts or irritation.
Cons and cautions
Limited moisturizing power
While it helps reduce water loss, it is not a heavy moisturizer. People with very dry skin may need to layer it with richer ingredients like shea butter or ceramides.
Rare sensitivity
A small number of users with extremely reactive skin might experience mild stinging or redness, though this is uncommon.
Best for
- People with oily or combination skin who want a lightweight moisturizer
- Anyone looking for a non-comedogenic emollient that won't clog pores
Use caution if
- Those with very dry or dehydrated skin may need a richer emollient alongside this ingredient
Usage tips
Safety summary
C21-C28 Alkane is considered safe for use in cosmetics. It has a low irritation and comedogenic risk, and is well-tolerated by most skin types. No significant safety concerns have been reported in standard cosmetic concentrations.
Research notes
Research on C21-C28 Alkane is limited but consistent with other plant-derived alkanes. Studies indicate it is non-irritating and non-sensitizing in human patch tests. Its safety is supported by the Cosmetic Ingredient Review (CIR) panel for similar alkane mixtures.
Common label clues
- Typical concentration
- 1% to 15%
- Regulatory status
- Approved for use in cosmetics globally, including by the U.S. FDA and the European Commission, with no known restrictions.
- Common uses
- Moisturizers, Serums, Sunscreens, Makeup, Lip products
- Environmental note
- Typically sourced from sugarcane or coconut, these alkanes are biodegradable and have a lower environmental impact compared to petroleum-derived alternatives.
Good to know
- C21-C28 Alkane is often used as a natural alternative to silicones like dimethicone.
- It is biodegradable and derived from renewable sources, making it a more sustainable choice.
Common questions
What is C21-C28 Alkane in beauty products?
C21-C28 Alkane is a mixture of natural hydrocarbons (alkanes) with chain lengths between 21 and 28 carbon atoms. It is typically derived from plant sources like sugarcane or coconut. In skincare, it acts as a lightweight emollient, meaning it softens and smooths the skin by forming a thin, breathable film that reduces water loss. Unlike heavy oils, it feels silky and non-greasy, making it popular in products that aim for a matte or velvety finish. It also helps dissolve other ingredients and improves the spreadability of formulas.
What does C21-C28 Alkane do in a beauty product?
When applied to the skin, C21-C28 Alkane spreads easily and forms a thin, non-occlusive film. This film helps reduce transepidermal water loss (TEWL) — the amount of water that evaporates from the skin — while allowing the skin to breathe. Its lightweight texture provides a silky, cushiony feel without leaving a greasy residue, and it can also help other active ingredients penetrate more evenly.
Is C21-C28 Alkane safe for most people?
C21-C28 Alkane is considered safe for use in cosmetics. It has a low irritation and comedogenic risk, and is well-tolerated by most skin types. No significant safety concerns have been reported in standard cosmetic concentrations.
Who should be careful with C21-C28 Alkane?
Those with very dry or dehydrated skin may need a richer emollient alongside this ingredient
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.