Ingredient review
Arachideth-20
INCI: ARACHIDETH-20
Arachideth-20 is a gentle synthetic emulsifier that helps mix oil and water in cleansers and lotions, with a low risk of irritation.
In plain English
Arachideth-20 is a man-made ingredient that helps oil and water stay mixed together in products like face washes and lotions. It's a type of surfactant, which means it can also help lift dirt and oil from your skin so they rinse away easily. Think of it as a gentle helper that keeps your cleanser smooth and effective without being harsh.
Quick decision guide
Useful, but context matters
Arachideth-20 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-20.
- 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-20 is a polyethylene glycol (PEG) ether of arachidyl alcohol, a fatty alcohol derived from plant oils. It belongs to the 'eth' family of emulsifiers, which are known for their mildness and ability to create stable oil-in-water emulsions.
How it works
In a cosmetic product, Arachideth-20 sits at the boundary between oil and water molecules, reducing surface tension so they blend into a smooth, stable mixture. This prevents your lotion or cleanser from separating into oily and watery layers. Its mild cleansing action helps remove surface dirt without stripping the skin's natural moisture barrier.
Pros
Gentle on skin
Arachideth-20 is considered a mild surfactant, making it suitable for daily use without causing excessive dryness or irritation for most skin types.
Improves product stability
It helps keep oil and water mixed, so your cleanser or lotion stays smooth and effective from first use to last.
Cons and cautions
Synthetic origin
As a man-made ingredient, some consumers prefer naturally derived alternatives, though Arachideth-20 is generally well-tolerated.
Potential for impurities
Like other PEG compounds, manufacturing processes can introduce trace impurities like ethylene oxide or 1,4-dioxane, though reputable brands test for purity.
Best for
- People with normal to combination skin looking for a gentle cleanser
- Anyone who prefers products with a smooth, creamy texture
Use caution if
- Those with known sensitivities to PEG compounds (rare)
Usage tips
Safety summary
Arachideth-20 is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for most skin types. As with any PEG compound, quality control during manufacturing is important to minimize impurities.
Research notes
Research on Arachideth-20 specifically is limited, but it belongs to a well-studied class of PEG ethers that are widely used and considered safe. The Cosmetic Ingredient Review has reviewed similar ingredients and found them safe for cosmetic use.
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 PEG ethers and found them safe at typical concentrations.
- Common uses
- Cleansers, Shampoos, Body washes, Emulsions
- Environmental note
- Arachideth-20 is biodegradable, but its production may involve palm oil derivatives, so look for sustainably sourced options if this is a concern.
Good to know
- Arachideth-20 is often used in combination with other emulsifiers for best results.
- It is considered biodegradable and is not known to accumulate in the environment.
Common questions
What is Arachideth-20 in beauty products?
Arachideth-20 is a man-made ingredient that helps oil and water stay mixed together in products like face washes and lotions. It's a type of surfactant, which means it can also help lift dirt and oil from your skin so they rinse away easily. Think of it as a gentle helper that keeps your cleanser smooth and effective without being harsh.
What does Arachideth-20 do in a beauty product?
In a cosmetic product, Arachideth-20 sits at the boundary between oil and water molecules, reducing surface tension so they blend into a smooth, stable mixture. This prevents your lotion or cleanser from separating into oily and watery layers. Its mild cleansing action helps remove surface dirt without stripping the skin's natural moisture barrier.
Is Arachideth-20 safe for most people?
Arachideth-20 is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for most skin types. As with any PEG compound, quality control during manufacturing is important to minimize impurities.
Who should be careful with Arachideth-20?
Those with known sensitivities to PEG compounds (rare)
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.