Ingredient review
Stearyl Acetyl Glutamate
INCI: Stearyl Acetyl Glutamate
A mild, amino-acid-based cleanser that effectively removes dirt and oil while respecting your skin's natural balance.
In plain English
Stearyl Acetyl Glutamate is a gentle cleansing ingredient made from a fatty alcohol (stearyl alcohol) and the amino acid glutamic acid. It works as a surfactant, meaning it helps water mix with oil and dirt so they can be rinsed away. Unlike harsh soaps, it cleans without stripping your skin's protective barrier, leaving it feeling soft and comfortable rather than tight or dry.
Review score
Safety, usefulness, and evidence
Strong fit for many routines
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
Easy yes for most routines
Stearyl Acetyl Glutamate 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 Stearyl Acetyl Glutamate.
- 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
Stearyl Acetyl Glutamate is a semi-synthetic compound created by combining stearyl alcohol (a fatty alcohol derived from plant oils) with glutamic acid (an amino acid naturally found in the skin). It belongs to the family of amino-acid-based surfactants, known for their mildness and compatibility with sensitive skin.
How it works
In a cosmetic product, Stearyl Acetyl Glutamate reduces the surface tension between water and oil, allowing impurities and excess sebum to be lifted away and rinsed off. Its molecular structure also helps it deposit a thin conditioning layer on the skin or hair, which reduces friction and leaves a smooth, non-greasy feel.
Pros
Gentle on skin barrier
Unlike harsh soaps that can strip away natural oils, Stearyl Acetyl Glutamate cleanses while helping maintain the skin's moisture barrier, reducing the risk of dryness and irritation.
Conditioning effect
It leaves a light, non-greasy film on the skin and hair that improves softness and manageability, making it a dual-purpose ingredient in cleansers and conditioners.
Cons and cautions
Lower foam volume
It produces a creamier, less bubbly lather compared to sulfate-based cleansers. Some users who enjoy a rich, foamy wash may find it less satisfying.
Higher formulation cost
Amino-acid surfactants are generally more expensive to produce, which can lead to a higher retail price for products containing them.
Best for
- People with dry, sensitive, or easily irritated skin looking for a mild cleanser
- Those who prefer sulfate-free, amino-acid-based cleansing formulas
Use caution if
- Individuals with a known allergy to any component of the ingredient (rare)
Usage tips
Safety summary
Stearyl Acetyl Glutamate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for sensitive and acne-prone skin. No significant safety concerns have been reported in regulatory or dermatological reviews.
Research notes
Amino-acid-based surfactants like Stearyl Acetyl Glutamate are well-documented in cosmetic science for their mildness and skin compatibility. While specific studies on this exact compound are limited, the broader class is supported by safety assessments from the Cosmetic Ingredient Review (CIR) panel and other regulatory bodies.
Common label clues
- Typical concentration
- 0.5% to 5% in rinse-off products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and most major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Facial cleansers, Body washes, Shampoos, Conditioners, Makeup removers
- Environmental note
- Derived from renewable plant-based fatty alcohols and amino acids. It is biodegradable and considered more environmentally friendly than some petroleum-based surfactants.
Good to know
- Stearyl Acetyl Glutamate is often listed near the middle or end of an ingredient list because effective concentrations are low.
- It is compatible with a wide pH range (around 5.5 to 7), making it easy to formulate into pH-balanced products.
Common questions
What is Stearyl Acetyl Glutamate in beauty products?
Stearyl Acetyl Glutamate is a gentle cleansing ingredient made from a fatty alcohol (stearyl alcohol) and the amino acid glutamic acid. It works as a surfactant, meaning it helps water mix with oil and dirt so they can be rinsed away. Unlike harsh soaps, it cleans without stripping your skin's protective barrier, leaving it feeling soft and comfortable rather than tight or dry.
What does Stearyl Acetyl Glutamate do in a beauty product?
In a cosmetic product, Stearyl Acetyl Glutamate reduces the surface tension between water and oil, allowing impurities and excess sebum to be lifted away and rinsed off. Its molecular structure also helps it deposit a thin conditioning layer on the skin or hair, which reduces friction and leaves a smooth, non-greasy feel.
Is Stearyl Acetyl Glutamate safe for most people?
Stearyl Acetyl Glutamate is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for sensitive and acne-prone skin. No significant safety concerns have been reported in regulatory or dermatological reviews.
Who should be careful with Stearyl Acetyl Glutamate?
Individuals with a known allergy to any component of the ingredient (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.