Ingredient · Amine-Based Conditioning Agent
Stearamidopropyl Dimethylamine (Fatty Acid Amine)
INCI · Stearamidopropyl Dimethylamine
Stearamidopropyl Dimethylamine (INCI: Stearamidopropyl Dimethylamine) is an amine-based amidoamine conditioning agent derived from stearic fatty acid, providing slip, detangling and softness in hair conditioners. It differs importantly from common quaternary ammonium conditioners such as BTMS and Cetrimonium Chloride: it does not already carry a positive charge. Instead, an acid in the formula, typically lactic or citric acid, protonates it, giving it a positive charge at low pH and making it cationic. This lets it adhere to hair's negatively charged surface and leave a thin conditioning film, providing slip, easier combing, an antistatic feel and a softer appearance. Its pH-dependent effectiveness means it must be assessed alongside the formula's acid-base balance; without the right pH, it may not deliver the expected conditioning feel. This explains its popularity in formulas seeking quaternary-ammonium-free conditioning. That is positioning, not a promise of superiority on its own. Labels show 'Stearamidopropyl Dimethylamine', generally alongside an acid ingredient. Klaris considers the conditioning system, pH context and the whole formula together.
i. Cosmetic Functions
Frequently Discussed Effects
The following headings summarise areas of effect frequently discussed in the literature; visible results in each area require regular use and a suitable formula.
Slip and Detangling
Adheres to hair for slip, easier combing and a softer appearance.
Acid Activation
Gains its positive charge from an acid in the formula, so works in low-pH conditioners.
An Antistatic Feel
Softens visible frizz by reducing static at the strand surface.
Mechanism
What Happens Within the Skin?
The following points summarise mechanisms from dermocosmetic literature in plain English. Klaris presents them as background information to help readers understand the context, not as medical claims.
Step 1
Amine-Based Amidoamine Structure
An amidoamine derived from stearic fatty acid that does not already carry a positive charge.
Step 2
Protonation by Acid
An acid such as lactic or citric acid protonates it at low pH, giving a positive charge and making it cationic.
Step 3
Hair Adhesion and Slip
Its acquired positive charge adheres to negatively charged hair, providing slip, detangling and an antistatic feel.
ii. Role in the Formula
How Is It Read on a Label?
Stearamidopropyl Dimethylamine is a fatty acid amidoamine. Unlike quaternary ammonium salts, it does not already carry a positive charge, becoming cationic through protonation by an acid such as lactic or citric acid in the formula. It is therefore used in low-pH conditioners and masks for slip, detangling and softness, and often chosen for quaternary-free conditioning formulas. Its effectiveness depends on the formula's pH balance.
Typical Concentration Range
0.5% - 3% (depending on formula context)
Ingredient Family
Conditioning Ingredients
iii. Sensitivity Advisory
A Note on Extra Care in Context
Generally a well-tolerated conditioning agent. Because its effects depend on formula pH, it is assessed in formula context, not alone. With known skin sensitivity, patch testing a new product is measured.
A sensitivity advisory is not an instruction for use; where individual health circumstances, pregnancy or known sensitivities are involved, discussing the decision with your doctor may be a more contextual approach.
Scientific Basis
Sources and Their Scope
The following headings indicate areas of research; they are not citations of a specific publication or confirmation that every statement on this page has been verified. The links provided should be read with their individual scope in mind.
- International INCI / CosIng database
- Formulation chemistry guides
- Cosmetic ingredient safety assessment groups
Starting Points for Independent Research
These links lead to official databases and serve as starting points for searches.
iv. Related Ingredients
Ingredients Often Read Together
v. Conditioning Ingredients Family
Other Ingredients in the Same Family
Explore ingredients in the same functional family to deepen your reading of formulas.
vi. Academy · Related Reading
For a Closer Look
6 Min Read
How to Read an INCI List on a Hair Product
Familiar ingredient families in shampoo, conditioner and masks, and how the context of the same list changes with your Hair Identity.
6 Min Read
Curly Hair Care: How to Read the Ingredients
Curls change how moisture is distributed along the strand: humectant and emollient families, frizz tendencies and the context of washing.
6 Min Read
Fine and Thick Hair: How to Read the Ingredients
Strand thickness, tolerance for weight and the appearance of volume: key ingredient families for fine and thick strands.
Klaris · Example Analyses
How Does Stearamidopropyl Dimethylamine (Fatty Acid Amine) Feature
in Your Products?
Explore product examples to see the ingredient list, general assessment and match score that changes with the example profile together.
Masked products and example profiles, not a personal analysis. Profile matching in the app is part of Klaris Premium. The app is currently available in Turkish. An English version is in preparation.