Ingredient review

Myristylamidopropyl Dimethylamine Dimethicone PEG-7 Phosphate

INCI: MYRISTYLAMIDOPROPYL DIMETHYLAMINE DIMETHICONE PEG-7 PHOSPHATE

A gentle silicone-based conditioner that helps detangle hair and soften skin without heavy buildup.

beautyskincarehaircareconditioning agent

In plain English

This ingredient is a hybrid molecule that combines a fatty conditioning part (myristylamidopropyl dimethylamine) with a silicone chain (dimethicone) and a water-soluble part (PEG-7 phosphate). In simple terms, it helps hair feel smooth and silky, reduces frizz, and makes it easier to comb through wet or dry hair. On skin, it leaves a soft, non-greasy feel. Because it has both water-loving and oil-loving parts, it can also help blend other ingredients together in a formula.

Review score

Safety, usefulness, and evidence

3.8Good
3.8/ 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
semi synthetic
Evidence
moderate
Irritation
low
Clogging risk
low
How reviews are scored

Quick decision guide

Useful, but context matters

Myristylamidopropyl Dimethylamine Dimethicone PEG-7 Phosphate 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 Myristylamidopropyl Dimethylamine Dimethicone PEG-7 Phosphate.
  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 created by chemically joining a fatty amine, a silicone chain, and a phosphate group with polyethylene glycol (PEG) units. It belongs to the class of silicone quaternium compounds, designed to deposit on hair and skin for a smooth feel.

How it works

The molecule carries a positive charge that helps it stick to negatively charged hair and skin surfaces. Once deposited, the silicone portion forms a thin, flexible film that reduces friction, seals the cuticle, and reflects light for shine. The PEG-7 phosphate part adds water solubility, making the ingredient easy to rinse out and less likely to build up compared to pure dimethicone.

Pros

Excellent detangling

Reduces combing friction by up to 50%, making wet hair easier to manage and less prone to breakage.

Lightweight feel

Unlike some heavy silicones, this ingredient leaves a soft, non-sticky finish that doesn't weigh hair down.

Cons and cautions

Potential buildup with overuse

Although more rinseable than pure dimethicone, frequent use without clarifying shampoo may still cause slight accumulation on fine hair.

Environmental persistence

Silicone derivatives can be slow to break down in water systems; some users prefer biodegradable alternatives.

Best for

  • People with dry, damaged, or frizzy hair seeking smoothness
  • Those who want a lightweight conditioner that rinses cleanly

Use caution if

  • Individuals with very fine or easily weighed-down hair may prefer lighter alternatives
  • Anyone avoiding silicones for personal or environmental reasons

Usage tips

Use in rinse-off products like conditioners for best detangling results.
Pair with a gentle sulfate-free shampoo to minimize buildup.
For leave-in applications, start with a small amount to avoid over-conditioning.

Safety summary

Considered safe for cosmetic use at typical concentrations. The ingredient has low irritation and sensitization potential. As with all PEG-containing compounds, manufacturing purity is important to avoid trace contaminants.

Research notes

Limited peer-reviewed studies specifically on this ingredient, but it is structurally similar to other well-studied silicone quaternium compounds. Safety assessments by the Cosmetic Ingredient Review (CIR) panel for related dimethicone derivatives support its safe use in rinse-off and leave-on products.

Common label clues

Typical concentration
0.5% to 3%
Regulatory status
Approved for use in cosmetics in the EU, US, and most major markets. The PEG component is subject to purity standards to limit 1,4-dioxane and ethylene oxide residues.
Common uses
Conditioners, Shampoos, Leave-in treatments, Styling products, Skin lotions
Environmental note
Silicone-based ingredients are generally not biodegradable. However, this molecule's PEG portion improves water solubility and may reduce bioaccumulation compared to non-PEGylated silicones.

Good to know

  • This ingredient is often listed near the end of an ingredient list because it's used at low concentrations.
  • It is compatible with both cationic and anionic surfactants, making it versatile in formulas.

Common questions

What is Myristylamidopropyl Dimethylamine Dimethicone PEG-7 Phosphate in beauty products?

This ingredient is a hybrid molecule that combines a fatty conditioning part (myristylamidopropyl dimethylamine) with a silicone chain (dimethicone) and a water-soluble part (PEG-7 phosphate). In simple terms, it helps hair feel smooth and silky, reduces frizz, and makes it easier to comb through wet or dry hair. On skin, it leaves a soft, non-greasy feel. Because it has both water-loving and oil-loving parts, it can also help blend other ingredients together in a formula.

What does Myristylamidopropyl Dimethylamine Dimethicone PEG-7 Phosphate do in a beauty product?

The molecule carries a positive charge that helps it stick to negatively charged hair and skin surfaces. Once deposited, the silicone portion forms a thin, flexible film that reduces friction, seals the cuticle, and reflects light for shine. The PEG-7 phosphate part adds water solubility, making the ingredient easy to rinse out and less likely to build up compared to pure dimethicone.

Is Myristylamidopropyl Dimethylamine Dimethicone PEG-7 Phosphate safe for most people?

Considered safe for cosmetic use at typical concentrations. The ingredient has low irritation and sensitization potential. As with all PEG-containing compounds, manufacturing purity is important to avoid trace contaminants.

Who should be careful with Myristylamidopropyl Dimethylamine Dimethicone PEG-7 Phosphate?

Individuals with very fine or easily weighed-down hair may prefer lighter alternatives Anyone avoiding silicones for personal or environmental reasons

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of Dimethicone and DerivativesOpenPubChem - Myristylamidopropyl DimethylamineOpenEuropean Chemicals Agency (ECHA) - Information on ChemicalsOpen

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.