Ingredient review
Arachideth-27
INCI: ARACHIDETH-27
Arachideth-27 is a gentle synthetic emulsifier that helps mix water and oil in cleansers and lotions, with a low risk of irritation.
In plain English
Arachideth-27 is a man-made ingredient that helps oil and water stay blended together in products like face washes and shampoos. It's part of a family of ingredients called ethoxylated alcohols, which are processed to be milder on skin. Think of it as a helper that keeps your cleanser from separating into layers.
Quick decision guide
Useful, but context matters
Arachideth-27 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 Arachideth-27.
- 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
Arachideth-27 is a polyethylene glycol (PEG) ether of arachidyl alcohol, a fatty alcohol derived from plant oils. It is created through ethoxylation, a process that adds ethylene oxide to make the ingredient water-soluble and gentle.
How it works
In a cosmetic product, Arachideth-27 sits at the boundary between oil and water droplets, reducing surface tension so they mix into a stable emulsion. It also helps lift dirt and oil from skin or hair so they can be rinsed away with water.
Pros
Gentle on skin
Arachideth-27 is considered low-irritation, making it suitable for sensitive skin types and daily use in cleansers.
Effective emulsifier
It reliably blends oil and water, preventing products from separating and ensuring a consistent texture.
Cons and cautions
Synthetic origin
As a PEG compound, it is not natural, which may be a drawback for those preferring plant-only ingredients.
Potential impurities
The ethoxylation process can leave trace amounts of 1,4-dioxane if not properly purified, though reputable manufacturers remove these.
Best for
- People with normal to dry skin looking for a gentle cleanser
- Anyone who prefers mild, non-stripping surfactants
Use caution if
- Those with known allergies to PEG compounds (rare)
- Individuals seeking 100% natural ingredient lists
Usage tips
Safety summary
Arachideth-27 is considered safe for use in cosmetics at typical concentrations. The main safety consideration is the potential for trace impurities from manufacturing, which are regulated and minimized by quality suppliers.
Research notes
Studies on ethoxylated alcohols like Arachideth-27 indicate low skin irritation and sensitization potential. The Cosmetic Ingredient Review (CIR) panel has reviewed similar PEG ethers and found them safe when formulated properly.
Common label clues
- Typical concentration
- Typically 0.5% to 5% of the formula
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions, subject to purity standards for ethoxylated ingredients.
- Common uses
- Cleansers, Shampoos, Body washes, Emulsions
- Environmental note
- May be derived from palm oil; look for RSPO-certified sources if sustainability is a concern.
Good to know
- Arachideth-27 is often used alongside other ethoxylated alcohols to fine-tune texture
- It is not typically found in leave-on products at high concentrations
Common questions
What is Arachideth-27 in beauty products?
Arachideth-27 is a man-made ingredient that helps oil and water stay blended together in products like face washes and shampoos. It's part of a family of ingredients called ethoxylated alcohols, which are processed to be milder on skin. Think of it as a helper that keeps your cleanser from separating into layers.
What does Arachideth-27 do in a beauty product?
In a cosmetic product, Arachideth-27 sits at the boundary between oil and water droplets, reducing surface tension so they mix into a stable emulsion. It also helps lift dirt and oil from skin or hair so they can be rinsed away with water.
Is Arachideth-27 safe for most people?
Arachideth-27 is considered safe for use in cosmetics at typical concentrations. The main safety consideration is the potential for trace impurities from manufacturing, which are regulated and minimized by quality suppliers.
Who should be careful with Arachideth-27?
Those with known allergies to PEG compounds (rare) Individuals seeking 100% natural ingredient lists
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.