Ingredient review
PEG-40 Ricinoleamide
INCI: PEG-40 Ricinoleamide
PEG-40 Ricinoleamide is a gentle emulsifier that helps mix oil and water in cleansers, but it may not suit those avoiding PEG compounds.
In plain English
PEG-40 Ricinoleamide is a helper ingredient that allows oil and water to blend together in products like face washes and shampoos. It is made by attaching a chain of polyethylene glycol (PEG) to ricinoleic acid, a fatty acid from castor oil. This gives it mild cleansing and foaming properties without being harsh on the skin.
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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
PEG-40 Ricinoleamide 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 PEG-40 Ricinoleamide.
- 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
PEG-40 Ricinoleamide is a semi-synthetic compound created by reacting castor oil derivatives with ethylene oxide. It belongs to the PEG (polyethylene glycol) family and is used primarily as an emulsifier and surfactant in rinse-off products.
How it works
In a cosmetic formula, PEG-40 Ricinoleamide reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. This helps cleansers remove dirt, makeup, and excess oil while rinsing away cleanly. Its mild surfactant action also contributes to a gentle foaming effect.
Pros
Gentle emulsifier
Effectively blends oil and water without harsh surfactants, making it suitable for daily cleansing routines.
Low irritation potential
Generally well-tolerated on skin, with low reported irritation and comedogenic ratings, so it's unlikely to clog pores.
Cons and cautions
Synthetic origin
As a PEG compound, it is not natural and may be a concern for those seeking plant-based or minimally processed ingredients.
Potential impurities
The manufacturing process can introduce trace amounts of 1,4-dioxane, a contaminant that some consumers prefer to avoid, though levels are typically regulated.
Best for
- People with normal to oily skin looking for a gentle cleanser
- Anyone using rinse-off products like shampoos or body washes
Use caution if
- Individuals with known sensitivity to PEG compounds or ethylene oxide derivatives
Usage tips
Safety summary
PEG-40 Ricinoleamide is considered safe for use in cosmetics at typical concentrations. The main concern is potential contamination with 1,4-dioxane, but reputable manufacturers control for this. It has low irritation and comedogenic risk.
Research notes
Research on PEG-40 Ricinoleamide is limited, but PEG compounds as a class are well-studied and considered safe in cosmetics. The Cosmetic Ingredient Review (CIR) panel has reviewed similar PEGs and found them safe when formulated properly.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics by the FDA and EU CosIng database, with concentration limits typically set by good manufacturing practices.
- Common uses
- Cleansers, Shampoos, Body washes, Makeup removers
- Environmental note
- PEG compounds are generally biodegradable, but the production process involves ethylene oxide, which has environmental and safety considerations.
Good to know
- PEG-40 Ricinoleamide is often found in sulfate-free cleansers as a gentle alternative to stronger surfactants.
- The number '40' refers to the average length of the PEG chain, which affects its solubility and mildness.
Common questions
What is PEG-40 Ricinoleamide in beauty products?
PEG-40 Ricinoleamide is a helper ingredient that allows oil and water to blend together in products like face washes and shampoos. It is made by attaching a chain of polyethylene glycol (PEG) to ricinoleic acid, a fatty acid from castor oil. This gives it mild cleansing and foaming properties without being harsh on the skin.
What does PEG-40 Ricinoleamide do in a beauty product?
In a cosmetic formula, PEG-40 Ricinoleamide reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. This helps cleansers remove dirt, makeup, and excess oil while rinsing away cleanly. Its mild surfactant action also contributes to a gentle foaming effect.
Is PEG-40 Ricinoleamide safe for most people?
PEG-40 Ricinoleamide is considered safe for use in cosmetics at typical concentrations. The main concern is potential contamination with 1,4-dioxane, but reputable manufacturers control for this. It has low irritation and comedogenic risk.
Who should be careful with PEG-40 Ricinoleamide?
Individuals with known sensitivity to PEG compounds or ethylene oxide derivatives
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.