Ingredient review

Horse Fatty Acyl Glutamic Acid

INCI: HORSE FATTY ACYL GLUTAMIC ACID

A mild, amino-acid-based surfactant from horse fat that cleanses without stripping the skin.

beautyskincarecleansing

In plain English

This ingredient is a gentle soap-like molecule made by combining fatty acids from horse fat with glutamic acid, an amino acid. It helps remove dirt and oil from your skin without causing dryness or irritation, making it a popular choice for sensitive skin cleansers.

Review score

Safety, usefulness, and evidence

4.0Good
4.0/ 5

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
natural
Evidence
moderate
Irritation
low
Clogging risk
low
How reviews are scored

Quick decision guide

Useful, but context matters

Horse Fatty Acyl Glutamic Acid 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Horse Fatty Acyl Glutamic Acid.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A surfactant (cleansing agent) created by reacting fatty acids from horse fat with glutamic acid, resulting in a mild, biodegradable cleanser.

How it works

It lowers the surface tension of water, allowing it to mix with oils and dirt on the skin so they can be rinsed away. Its amino acid base makes it less harsh than traditional sulfates.

Pros

Very gentle on skin

Its amino acid structure makes it much milder than traditional sulfates, reducing the risk of irritation and dryness.

Biodegradable

This surfactant breaks down more easily in the environment compared to many synthetic cleansers.

Cons and cautions

Animal-derived

Sourced from horse fat, which may not align with vegan or cruelty-free preferences.

Limited research

There is less published data on horse-derived acyl glutamates compared to plant-based versions.

Best for

  • People with sensitive or dry skin
  • Those seeking a mild, non-stripping cleanser

Use caution if

  • Vegans or those avoiding animal-derived ingredients
  • Anyone allergic to horse-derived components (rare)

Usage tips

Use in rinse-off cleansers for best results
Pair with other mild surfactants for a balanced formula
Avoid high concentrations to maintain gentleness

Safety summary

Considered safe for topical use with low irritation and comedogenic risk. No significant safety concerns reported in cosmetic applications.

Research notes

Amino acid surfactants are well-studied for mildness, but specific studies on horse fatty acyl glutamic acid are limited. General safety data for acyl glutamates supports their use.

Common label clues

Typical concentration
1–10% in rinse-off products
Regulatory status
Generally recognized as safe for cosmetic use in the EU and US, with no specific restrictions beyond standard surfactant guidelines.
Common uses
Facial cleansers, Body washes, Shampoos
Environmental note
Horse fat is a byproduct of the meat industry, so it may be considered a waste-reducing ingredient, but its animal origin raises ethical concerns for some.

Good to know

  • This ingredient is similar to plant-based acyl glutamates but uses horse fat as the fatty acid source.
  • It is often used in 'amino acid' cleansers marketed for sensitive skin.

Common questions

What is Horse Fatty Acyl Glutamic Acid in beauty products?

This ingredient is a gentle soap-like molecule made by combining fatty acids from horse fat with glutamic acid, an amino acid. It helps remove dirt and oil from your skin without causing dryness or irritation, making it a popular choice for sensitive skin cleansers.

What does Horse Fatty Acyl Glutamic Acid do in a beauty product?

It lowers the surface tension of water, allowing it to mix with oils and dirt on the skin so they can be rinsed away. Its amino acid base makes it less harsh than traditional sulfates.

Is Horse Fatty Acyl Glutamic Acid safe for most people?

Considered safe for topical use with low irritation and comedogenic risk. No significant safety concerns reported in cosmetic applications.

Who should be careful with Horse Fatty Acyl Glutamic Acid?

Vegans or those avoiding animal-derived ingredients Anyone allergic to horse-derived components (rare)

Research sources

Cosmetic Ingredient Review – Amino Acid SurfactantsOpenPubMed – Mild Surfactants for Sensitive SkinOpenECHA – Sodium Cocoyl Glutamate SafetyOpen

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.