Ingredient review
Glycereth-20 Stearate
INCI: GLYCERETH-20 STEARATE
A reliable, low-irritation emulsifier that helps create smooth, stable creams and lotions.
In plain English
Glycereth-20 Stearate is a helper ingredient that allows water and oil to mix together in a product, so your moisturizer or lotion stays smooth and doesn't separate. It's made from glycerin (a common moisturizing ingredient) and stearic acid (a fatty acid found in plants), and it's processed to be very gentle on skin. Think of it as the ingredient that keeps your cream from turning into a watery mess.
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
Glycereth-20 Stearate 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 Glycereth-20 Stearate.
- 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
Glycereth-20 Stearate is a semi-synthetic compound created by combining glycerin (a humectant) with stearic acid (a fatty acid) and adding ethylene oxide to make it water-friendly. It belongs to a class of ingredients called emulsifiers, which are essential for stable oil-in-water emulsions.
How it works
In a cosmetic product, Glycereth-20 Stearate sits at the boundary between oil and water droplets, reducing surface tension so they can mix evenly. This creates a uniform, creamy texture that feels smooth on the skin. It also has mild skin-conditioning properties, leaving a soft, non-greasy feel.
Pros
Gentle on skin
Glycereth-20 Stearate has a very low irritation risk, making it suitable for sensitive skin types and daily use in moisturizers.
Improves product texture
It ensures your cream or lotion stays smooth and doesn't separate, so you get a consistent dose of ingredients every time you apply.
Cons and cautions
Not a natural ingredient
Because it's processed with ethylene oxide, it's considered semi-synthetic, which may not appeal to those seeking all-natural skincare.
Potential sustainability issues
Stearic acid is often sourced from palm oil, which can be linked to deforestation unless certified sustainable.
Best for
- Anyone using creams or lotions who wants a stable, non-separating product
- People with sensitive or reactive skin who need gentle formulations
Use caution if
- Those seeking a purely natural or organic product (it is semi-synthetic)
Usage tips
Safety summary
Glycereth-20 Stearate is considered safe for use in cosmetics at typical concentrations (1–5%). It has low irritation and comedogenic potential, making it suitable for most skin types. No significant safety concerns have been reported in regulatory reviews.
Research notes
Research on Glycereth-20 Stearate is limited, but it is a well-established emulsifier with a long history of safe use. Studies on similar ethoxylated glycerin derivatives indicate low toxicity and skin compatibility. The Cosmetic Ingredient Review (CIR) panel has reviewed related ingredients and found them safe as used.
Common label clues
- Typical concentration
- 1% to 5%
- Regulatory status
- Approved for use in cosmetics by the FDA and the European Commission, with no known restrictions at typical concentrations.
- Common uses
- Moisturizers, Creams, Lotions, Cleansers
- Environmental note
- The stearic acid component may be derived from palm oil; look for RSPO-certified palm oil or plant-based alternatives to support sustainability.
Good to know
- Glycereth-20 Stearate is considered safe by major regulatory bodies when used within typical concentrations.
- It is not a preservative or active ingredient, so it won't directly treat skin concerns like acne or aging.
Common questions
What is Glycereth-20 Stearate in beauty products?
Glycereth-20 Stearate is a helper ingredient that allows water and oil to mix together in a product, so your moisturizer or lotion stays smooth and doesn't separate. It's made from glycerin (a common moisturizing ingredient) and stearic acid (a fatty acid found in plants), and it's processed to be very gentle on skin. Think of it as the ingredient that keeps your cream from turning into a watery mess.
What does Glycereth-20 Stearate do in a beauty product?
In a cosmetic product, Glycereth-20 Stearate sits at the boundary between oil and water droplets, reducing surface tension so they can mix evenly. This creates a uniform, creamy texture that feels smooth on the skin. It also has mild skin-conditioning properties, leaving a soft, non-greasy feel.
Is Glycereth-20 Stearate safe for most people?
Glycereth-20 Stearate is considered safe for use in cosmetics at typical concentrations (1–5%). It has low irritation and comedogenic potential, making it suitable for most skin types. No significant safety concerns have been reported in regulatory reviews.
Who should be careful with Glycereth-20 Stearate?
Those seeking a purely natural or organic product (it is semi-synthetic)
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.