Roll Call

“Cocamidopropyl Betaine?”Here!

SurfactantConditioning agentPlant

Appears in 1 scanned product.

In personal care

A surfactant derived from coconut oil fatty acids reacted with dimethylaminopropylamine, then converted to a betaine. It behaves as both a mild cleanser and a foam booster.

Why it’s used

One of the most common secondary surfactants in shampoos, face washes, and baby products because it produces rich, stable foam and softens the sting of harsher detergents, making formulas feel gentler.

What the evidence says

Two CIR-affiliated safety reviews identify skin/eye irritation and skin sensitization as the main concerns with cocamidopropyl betaine, but attribute much of the sensitization risk to residual manufacturing impurities (DMAPA and amidoamine) rather than the purified molecule itself. Both reviews conclude the ingredient is safe at concentrations used in cosmetics (up to 30% rinse-off, 6% leave-on) when formulated to be nonsensitizing, with a calculated margin of safety over 100. The underlying data come from industry-style toxicology panels rather than independent clinical outcome studies, and irritation/sensitization findings are described only in summary form without details on study design or severity.

Context

Almost always used in rinse-off products at low percentages. Reported sensitization is uncommon relative to its extremely wide use, and tends to involve older or lower-purity batches.

Rumors

  1. Cocamidopropyl betaine causes organ system toxicity, harming the immune, respiratory and reproductive systems.

    Does not support — suggestivehealth and safety evidence

    Measured as an outcome.

    Who’s saying this

    • face naturals — a brand: sells natural and organic skincare products
      How we know who this is
      • “face naturals was created to provide my family with safe, pure, organic, and natural products while also making these same products accessible and affordable for other like-minded individuals and their families.” (their page)

  2. Cocamidopropyl betaine releases nitrosamines that cause cancer.

    Not gradedhealth and safety evidence

    Sources cited — no verdict reached.

    What was measured is not yet noted.

    Who’s saying this

    • face naturals — a brand: sells natural and organic skincare products
      How we know who this is
      • “face naturals was created to provide my family with safe, pure, organic, and natural products while also making these same products accessible and affordable for other like-minded individuals and their families.” (their page)

  3. Cocamidopropyl betaine causes allergic contact dermatitis (skin allergy with redness, itching and blisters).

    Supports — establishedhealth and safety evidence

    Studied in: patients referred for diagnostic patch testing due to suspected allergic contact dermatitis (not general healthy cosmetic users).

    Measured as an outcome.

    Who’s saying this

    • face naturals — a brand: sells natural and organic skincare products
      How we know who this is
      • “face naturals was created to provide my family with safe, pure, organic, and natural products while also making these same products accessible and affordable for other like-minded individuals and their families.” (their page)

  4. Cocamidopropyl betaine cleanses without drying out skin or hair.

    Supports — suggestivehealth and safety evidence

    Measured as a biomarker.

    Who’s saying this

    • Soaper's Choice — a retailer: supplies soap making oils, waxes and butters; owned by Columbus Vegetable Oils
      How we know who this is
      • “For nearly three decades, Soaper's Choice has been a dedicated supply partner to the artisan soap and related products community.” (their page)
      • “Founded in 1998, Soaper's Choice is proudly owned and operated by Columbus Vegetable Oils, a fourth-generation, woman-owned business with nearly 90 years of experience in sourcing, processing, and delivering top-quality oils, fats, dressings, sauces, and dips.” (their page)

  5. Cocamidopropyl betaine is a gentle cleanser that reduces irritation and is suitable for sensitive skin.

    Supports — suggestivehealth and safety evidence

    Measured as an outcome.

    Who’s saying this

    • Bulk Apothecary — a retailer: sells soap making supplies, natural ingredients and essential oils
      How we know who this is
      • “Bulk Apothecary was founded in mid 2010 as a small brick & mortar specialty retailer in Streetsboro, Ohio and has since grown to become one of the nation's largest online suppliers of natural ingredients and essential oils.” (their page)