Ingredient review
Dihydrocholeth-30
INCI: Dihydrocholeth-30
A gentle emulsifier that helps blend water and oil in formulas, with a structure similar to skin-friendly cholesterol.
In plain English
Dihydrocholeth-30 is a semi-synthetic ingredient made by attaching a chain of ethylene oxide molecules to a modified form of cholesterol. This gives it the ability to mix oil and water, so creams and lotions stay smooth and don't separate. Because it's related to cholesterol, a natural part of your skin's barrier, it's considered very gentle and non-irritating for most skin types.
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
Dihydrocholeth-30 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 Dihydrocholeth-30.
- 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 polyethylene glycol (PEG) ether of dihydrocholesterol, created by reacting dihydrocholesterol with ethylene oxide. It is a waxy, water-soluble solid used primarily as a non-ionic emulsifier.
How it works
Its molecular structure has a cholesterol-like oil-loving tail and a water-loving PEG chain. When added to a formula, it positions itself at the interface of oil and water droplets, reducing surface tension and allowing them to mix into a stable emulsion. This helps create creamy, uniform textures that feel smooth on the skin.
Pros
Gentle on skin
Its cholesterol-like structure makes it very mild, reducing the risk of irritation or stinging even for sensitive skin types.
Effective emulsifier
It reliably blends oil and water phases, giving lotions and creams a smooth, non-greasy feel that spreads easily.
Cons and cautions
PEG-derived concerns
As a PEG compound, it may carry trace impurities like 1,4-dioxane if not highly purified, though reputable brands use refined grades.
Not biodegradable
PEG-based ingredients can persist in the environment, which may be a concern for eco-conscious consumers.
Best for
- People with normal to dry skin looking for gentle moisturizers
- Those with sensitive skin who react to harsher emulsifiers
Use caution if
- Individuals who strictly avoid all PEG-derived ingredients due to personal preference or ethical concerns
Usage tips
Safety summary
Dihydrocholeth-30 is considered safe for cosmetic use at typical concentrations. The main concern is potential contamination with 1,4-dioxane during manufacturing, but this is controlled by good manufacturing practices. It has low irritation and comedogenic potential.
Research notes
The safety of PEG derivatives has been reviewed by the Cosmetic Ingredient Review (CIR) panel, which concluded they are safe as used in cosmetics. Specific studies on dihydrocholeth-30 are limited, but its cholesterol-like structure suggests good skin compatibility.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The Cosmetic Ingredient Review (CIR) panel has deemed PEG derivatives safe when properly formulated.
- Common uses
- Moisturizers, Serums, Cleansers, Sunscreens
- Environmental note
- PEG compounds are not readily biodegradable, so they may accumulate in aquatic environments. However, dihydrocholeth-30 is used in small amounts in rinse-off and leave-on products.
Good to know
- Dihydrocholeth-30 is often used in 'cholesterol-based' moisturizers aimed at barrier repair.
- It is considered safe by the Cosmetic Ingredient Review (CIR) panel at typical use levels.
Common questions
What is Dihydrocholeth-30 in beauty products?
Dihydrocholeth-30 is a semi-synthetic ingredient made by attaching a chain of ethylene oxide molecules to a modified form of cholesterol. This gives it the ability to mix oil and water, so creams and lotions stay smooth and don't separate. Because it's related to cholesterol, a natural part of your skin's barrier, it's considered very gentle and non-irritating for most skin types.
What does Dihydrocholeth-30 do in a beauty product?
Its molecular structure has a cholesterol-like oil-loving tail and a water-loving PEG chain. When added to a formula, it positions itself at the interface of oil and water droplets, reducing surface tension and allowing them to mix into a stable emulsion. This helps create creamy, uniform textures that feel smooth on the skin.
Is Dihydrocholeth-30 safe for most people?
Dihydrocholeth-30 is considered safe for cosmetic use at typical concentrations. The main concern is potential contamination with 1,4-dioxane during manufacturing, but this is controlled by good manufacturing practices. It has low irritation and comedogenic potential.
Who should be careful with Dihydrocholeth-30?
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.