Ingredient review

Bis-Isobutyl PEG-14/Amodimethicone Copolymer

INCI: BIS-ISOBUTYL PEG-14/AMODIMETHICONE COPOLYMER

A gentle silicone polymer that helps products spread smoothly and leaves hair and skin feeling silky without heavy buildup.

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In plain English

This is a type of silicone that forms a thin, flexible film on your skin or hair. It helps other ingredients spread evenly, reduces friction, and gives a smooth, non-greasy feel. It also helps make products more water-resistant without feeling sticky or heavy.

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

Quick decision guide

Useful, but context matters

Bis-Isobutyl PEG-14/Amodimethicone Copolymer 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 Bis-Isobutyl PEG-14/Amodimethicone Copolymer.
  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 modified silicone polymer that combines amodimethicone (a conditioning silicone) with PEG chains and isobutyl groups to improve water dispersibility and reduce buildup.

How it works

When applied, it forms a uniform, breathable film on the surface of skin or hair. This film smooths the cuticle (the outer layer of hair) or skin texture, reduces frizz, and helps lock in moisture. The PEG portion makes it easier to rinse out compared to traditional silicones.

Pros

Smooth, silky feel

Creates a soft, velvety texture on skin and hair without heavy greasiness, making products feel luxurious.

Good water resistance

Helps sunscreens and makeup last longer by forming a protective film that resists water and sweat.

Cons and cautions

Not silicone-free

If you follow a silicone-free routine, this ingredient will not fit your preferences.

Potential buildup

Overuse without adequate cleansing can lead to a film that may dull hair or clog pores for some skin types.

Best for

  • People with dry or frizzy hair seeking smoothness
  • Those who want a lightweight, non-greasy feel in skincare or makeup

Use caution if

  • Those strictly avoiding all silicones
  • Individuals with very fine hair who find any silicone weighs hair down

Usage tips

Use clarifying shampoo occasionally if you use many silicone-based hair products to prevent buildup.
Pair with water-based serums or moisturizers for best layering results.

Safety summary

Considered safe for topical use at typical cosmetic concentrations. Low irritation and comedogenic risk. Some individuals may prefer to avoid silicones for personal or environmental reasons.

Research notes

Silicone copolymers are well-studied for their film-forming and conditioning properties. This specific variant is less documented than common dimethicone, but its safety profile is supported by broader silicone safety data.

Common label clues

Typical concentration
0.5% to 5%
Regulatory status
Approved for use in cosmetics in the EU, US, and many other regions. No known restrictions at typical use levels.
Common uses
Hair conditioners, Leave-in treatments, Styling products, Sunscreens, Color cosmetics
Environmental note
Silicones can be slow to biodegrade. However, modified versions like this one are designed to be more easily removed in wastewater treatment.

Good to know

  • This ingredient is often found in 'smoothing' or 'anti-frizz' hair products.
  • It is considered a 'modified silicone' designed to be easier to wash out than older silicones.

Common questions

What is Bis-Isobutyl PEG-14/Amodimethicone Copolymer in beauty products?

This is a type of silicone that forms a thin, flexible film on your skin or hair. It helps other ingredients spread evenly, reduces friction, and gives a smooth, non-greasy feel. It also helps make products more water-resistant without feeling sticky or heavy.

What does Bis-Isobutyl PEG-14/Amodimethicone Copolymer do in a beauty product?

When applied, it forms a uniform, breathable film on the surface of skin or hair. This film smooths the cuticle (the outer layer of hair) or skin texture, reduces frizz, and helps lock in moisture. The PEG portion makes it easier to rinse out compared to traditional silicones.

Is Bis-Isobutyl PEG-14/Amodimethicone Copolymer safe for most people?

Considered safe for topical use at typical cosmetic concentrations. Low irritation and comedogenic risk. Some individuals may prefer to avoid silicones for personal or environmental reasons.

Who should be careful with Bis-Isobutyl PEG-14/Amodimethicone Copolymer?

Those strictly avoiding all silicones Individuals with very fine hair who find any silicone weighs hair down

Research sources

Cosmetic Ingredient Review (CIR) - Safety of SiliconesOpenPersonal Care Council - Silicone PolymersOpenPubMed - Silicone in CosmeticsOpen

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.