Ingredient review

AMP-Isostearoyl Gelatin/Keratin Amino Acids/Lysine Hydroxypropyltrimonium Chloride

INCI: AMP-Isostearoyl Gelatin/Keratin Amino Acids/Lysine Hydroxypropyltrimonium Chloride

A gentle, multi-ingredient conditioning complex that smooths hair without heavy buildup, best for those seeking softness and manageability.

beautyhaircareconditioning agent

In plain English

This ingredient is a blend of modified proteins (from gelatin and keratin) and a positively charged amino acid derivative. In simple terms, it coats the hair shaft to reduce friction, making hair easier to comb, less frizzy, and softer to the touch. The positive charge helps it stick to damaged or negatively charged hair areas, so it works especially well on dry or color-treated hair.

Quick decision guide

Useful, but context matters

AMP-Isostearoyl Gelatin/Keratin Amino Acids/Lysine Hydroxypropyltrimonium Chloride 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 AMP-Isostearoyl Gelatin/Keratin Amino Acids/Lysine Hydroxypropyltrimonium Chloride.
  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 semi-synthetic conditioning polymer made by combining fatty acids (from isostearic acid) with hydrolyzed gelatin, keratin amino acids, and a quaternized lysine derivative. It is designed to deposit a thin, flexible film on hair.

How it works

The positively charged (cationic) part of the molecule binds to the negatively charged surface of hair, especially areas damaged by chemical treatments or heat. The protein fragments fill in gaps in the hair cuticle, while the fatty acid portion adds a light, lubricating layer that reduces tangling and static.

Pros

Lightweight conditioning

Provides noticeable slip and softness without the heavy, greasy feel of some silicones or oils, making it ideal for fine to medium hair.

Targeted repair for damage

The protein fragments bind to damaged cuticle areas, helping to smooth the hair surface and reduce breakage from brushing.

Cons and cautions

Potential buildup on fine hair

If used too frequently or in high concentrations, the polymer can accumulate, making hair feel stiff or dull. Clarifying shampoo can help.

Not vegan-friendly

Contains gelatin (from animal collagen) and keratin (often from animal sources), so it is not suitable for strict vegan or cruelty-free routines.

Best for

  • People with dry, damaged, or color-treated hair seeking extra softness
  • Those who want a lightweight conditioner that won't weigh hair down

Use caution if

  • Vegans or those avoiding animal-derived ingredients (gelatin and keratin are from animal sources)

Usage tips

Use a clarifying shampoo once a week if you notice buildup or limpness.
Pair with a lightweight leave-in conditioner for extra detangling without overloading fine hair.
Avoid applying directly to the scalp if you have oily roots; focus on mid-lengths and ends.

Safety summary

Considered safe for use in rinse-off and leave-on hair products at typical concentrations. Mild and unlikely to cause irritation or sensitization. Not known to be comedogenic.

Research notes

Limited independent clinical studies on this specific blend, but its individual components (hydrolyzed proteins, quaternized amino acids) are well-documented for hair conditioning and damage repair. The combination is designed to offer synergistic benefits.

Common label clues

Typical concentration
0.5% to 5%
Regulatory status
Approved for use in cosmetics in the US, EU, and many other regions. No specific restrictions beyond general cosmetic safety requirements.
Common uses
Shampoos, Conditioners, Hair masks, Leave-in treatments
Environmental note
The gelatin and keratin components are by-products of the meat and leather industries, so their use can be considered upcycling. However, the manufacturing process involves chemical modification, which has an environmental footprint.

Good to know

  • This ingredient is often listed near the middle or end of an ingredient list, indicating it is used at moderate to low concentrations.
  • It is compatible with both sulfate and sulfate-free surfactants.

Common questions

What is AMP-Isostearoyl Gelatin/Keratin Amino Acids/Lysine Hydroxypropyltrimonium Chloride in beauty products?

This ingredient is a blend of modified proteins (from gelatin and keratin) and a positively charged amino acid derivative. In simple terms, it coats the hair shaft to reduce friction, making hair easier to comb, less frizzy, and softer to the touch. The positive charge helps it stick to damaged or negatively charged hair areas, so it works especially well on dry or color-treated hair.

What does AMP-Isostearoyl Gelatin/Keratin Amino Acids/Lysine Hydroxypropyltrimonium Chloride do in a beauty product?

The positively charged (cationic) part of the molecule binds to the negatively charged surface of hair, especially areas damaged by chemical treatments or heat. The protein fragments fill in gaps in the hair cuticle, while the fatty acid portion adds a light, lubricating layer that reduces tangling and static.

Is AMP-Isostearoyl Gelatin/Keratin Amino Acids/Lysine Hydroxypropyltrimonium Chloride safe for most people?

Considered safe for use in rinse-off and leave-on hair products at typical concentrations. Mild and unlikely to cause irritation or sensitization. Not known to be comedogenic.

Who should be careful with AMP-Isostearoyl Gelatin/Keratin Amino Acids/Lysine Hydroxypropyltrimonium Chloride?

Vegans or those avoiding animal-derived ingredients (gelatin and keratin are from animal sources)

Research sources

CosIng - European Commission databaseOpenPersonal Care Council - Ingredient SafetyOpenPubMed - Hydrolyzed proteins in hair careOpen

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.