Isopropyl Alcohol

EYE-so-PROH-pul AL-kuh-hol

Solvent 3/10 Safety Not CGAvoid Synthetic Vegan

What Is Isopropyl Alcohol?

Isopropyl Alcohol is a short-chain drying alcohol commonly used as a solvent and quick-drying agent in hair care products. Unlike fatty alcohols (cetyl, cetearyl), it evaporates rapidly and can be extremely drying to the hair shaft. It is used in hair sprays, mousses, and gels to help products dry quickly and in some sanitizing scalp treatments.

Source: Petroleum-derived (propylene hydration)

Origin: Synthetic

Also known as: Rubbing Alcohol, IPA, Isopropanol, 2-Propanol

What Does Isopropyl Alcohol Do to Your Hair?

Isopropyl Alcohol acts as a fast-evaporating solvent that helps dissolve other ingredients and allows products to dry quickly on the hair. In hair sprays and mousses, it carries styling polymers and then evaporates to leave behind the hold. While functional, frequent use strips natural oils and moisture from the hair shaft and can damage the cuticle over time.

Best For

Quick-drying styling needs, oil-dissolving purposes

Not Recommended For

Dry hair, curly hair (3A-4C), damaged hair, color-treated hair, all hair types with regular use

Concentration Matters

1-50%

Hair Type Compatibility

1A Straight Fine
1B Straight Medium
1C Straight Coarse
2A Wavy Fine
2B Wavy Medium
2C Wavy Coarse
3A Curly Loose
3B Curly Tight
3C Curly Corkscrew
4A Coily S-Shaped
4B Coily Z-Shaped
4C Coily Tight
Color-treated: Use caution Heat-damaged: Not recommended

Method Compatibility

Curly Girl (CG) Method: Avoid
CG Avoid

Safety & Regulation

3/10
AvoidCautionSafe

Drying and irritating with prolonged or frequent use. Can strip the hair cuticle and cause brittleness. Mildly irritating to the scalp. Flammable. Toxic if ingested. Generally considered one of the most damaging common hair care ingredients when present in high concentrations.

FDA Status: Generally Recognized As Safe

FDA permits use in cosmetics and OTC drug products. Used as an antiseptic active ingredient in OTC products at 50-91.3%.

EWG Score: 3/10

HairAide Verdict

Isopropyl Alcohol is best avoided in hair care products, especially in leave-on formulations where it is listed among the first five ingredients. Small amounts in rinse-off products are less concerning. HairAide recommends choosing alcohol-free styling products or those containing only fatty alcohols instead.

Products That Contain Isopropyl Alcohol

Hair sprays, mousses, gels, scalp antiseptics, quick-dry styling products

Alternatives to Isopropyl Alcohol

If you want to avoid Isopropyl Alcohol, look for products with these ingredients instead:

Ethanol (denatured alcohol), SD Alcohol 40-B, Propanediol

Frequently Asked Questions

Is Isopropyl Alcohol safe for hair?

Isopropyl Alcohol has a safety rating of 3/10 and may be problematic for many hair types. Drying and irritating with prolonged or frequent use. Can strip the hair cuticle and cause brittleness. Mildly irritating to the scalp. Flammable. Toxic if ingested. Generally considered one of the most damaging common hair care ingredients when present in high concentrations.

Is Isopropyl Alcohol bad for curly hair?

Isopropyl Alcohol is not CG-method approved. Curly hair types may want to avoid this ingredient or use products containing it sparingly.

Is Isopropyl Alcohol CG-method approved?

No, Isopropyl Alcohol is not approved for the Curly Girl method.

What can I use instead of Isopropyl Alcohol?

Some alternatives to Isopropyl Alcohol include: Ethanol (denatured alcohol), SD Alcohol 40-B, Propanediol

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