Ingredient review
PEG-16 Castor Oil
INCI: PEG-16 Castor Oil
PEG-16 Castor Oil is a gentle emulsifier that helps mix oil and water, making it a common ingredient in cleansers and makeup removers, but it may not suit those avoiding PEGs.
In plain English
PEG-16 Castor Oil is a lab-made ingredient that helps water and oil blend together in products like cleansers and makeup removers. It is made by attaching polyethylene glycol (PEG) chains to castor oil, which makes the oil water-friendly. This allows it to gently lift dirt, oil, and makeup from your skin so they can be rinsed away easily. It is generally considered safe and mild, but some people prefer to avoid PEGs due to potential contamination concerns during manufacturing.
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-16 Castor Oil 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-16 Castor Oil.
- 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-16 Castor Oil is a semi-synthetic compound created by reacting castor oil with ethylene oxide to form a polyethylene glycol (PEG) derivative. It acts as a non-ionic surfactant and emulsifier, meaning it helps stabilize mixtures of oil and water without carrying an electrical charge.
How it works
In a cosmetic product, PEG-16 Castor Oil reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. When used in a cleanser, it surrounds oil-based impurities and makeup, breaking them into tiny droplets that can be washed away with water. This makes it effective for removing waterproof makeup and excess sebum without stripping the skin's natural moisture barrier.
Pros
Gentle makeup removal
PEG-16 Castor Oil effectively dissolves waterproof makeup and sunscreen without requiring harsh scrubbing, reducing the risk of irritation.
Mild on skin
It has a low irritation and comedogenic rating, making it suitable for most skin types, including sensitive skin, when used in rinse-off products.
Cons and cautions
Potential trace contaminants
During the manufacturing process, PEG compounds can be contaminated with 1,4-dioxane, a possible carcinogen. However, reputable brands purify their ingredients to meet safety limits set by regulators.
Not natural
Despite being derived from castor oil, PEG-16 Castor Oil is chemically modified and not considered a natural ingredient, which may be a drawback for clean beauty enthusiasts.
Best for
- People who wear heavy or waterproof makeup and need a gentle but effective remover
- Those with normal to oily skin looking for a non-stripping cleanser
Use caution if
- Individuals who strictly avoid all PEG-derived ingredients due to personal preference or ethical concerns
Usage tips
Safety summary
PEG-16 Castor Oil is considered safe for use in cosmetics at typical concentrations. The main safety concern is potential contamination with 1,4-dioxane, but regulatory agencies set strict limits, and reputable manufacturers test for purity. It is non-irritating and non-comedogenic for most people.
Research notes
The Cosmetic Ingredient Review (CIR) panel has reviewed PEG derivatives and concluded they are safe for use in cosmetics when formulated to be free of 1,4-dioxane. No specific studies on PEG-16 Castor Oil alone were found, but it is grouped with other PEG compounds that have a long history of safe use.
Common label clues
- Typical concentration
- 1% to 10% in rinse-off products; lower in leave-on products
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission. The Cosmetic Ingredient Review (CIR) panel has deemed PEG derivatives safe when formulated to meet purity standards.
- Common uses
- Cleansers, Makeup removers, Facial washes, Shampoos
- Environmental note
- PEG compounds are generally biodegradable, but their production involves ethylene oxide, which is derived from fossil fuels. Some environmental groups prefer plant-based alternatives.
Good to know
- PEG-16 Castor Oil is often listed near the top of ingredient lists in cleansing balms and oils because it is a primary emulsifier.
- The number '16' refers to the average number of ethylene oxide units in the PEG chain, which affects its water solubility and mildness.
Common questions
What is PEG-16 Castor Oil in beauty products?
PEG-16 Castor Oil is a lab-made ingredient that helps water and oil blend together in products like cleansers and makeup removers. It is made by attaching polyethylene glycol (PEG) chains to castor oil, which makes the oil water-friendly. This allows it to gently lift dirt, oil, and makeup from your skin so they can be rinsed away easily. It is generally considered safe and mild, but some people prefer to avoid PEGs due to potential contamination concerns during manufacturing.
What does PEG-16 Castor Oil do in a beauty product?
In a cosmetic product, PEG-16 Castor Oil reduces the surface tension between oil and water, allowing them to mix into a stable emulsion. When used in a cleanser, it surrounds oil-based impurities and makeup, breaking them into tiny droplets that can be washed away with water. This makes it effective for removing waterproof makeup and excess sebum without stripping the skin's natural moisture barrier.
Is PEG-16 Castor Oil safe for most people?
PEG-16 Castor Oil is considered safe for use in cosmetics at typical concentrations. The main safety concern is potential contamination with 1,4-dioxane, but regulatory agencies set strict limits, and reputable manufacturers test for purity. It is non-irritating and non-comedogenic for most people.
Who should be careful with PEG-16 Castor Oil?
Individuals who strictly avoid all PEG-derived ingredients due to personal preference or ethical concerns
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.