Conventional shampoo and conditioner — safety profile

What is this product?

Mass-market shampoos and conditioners sold at drugstores and supermarkets. This category is among the highest-frequency personal care product exposures — daily use, direct scalp application, and hot-water rinse conditions that may enhance absorption. Key chemical concerns: (1) parabens (methylparaben, propylparaben, butylparaben) as preservatives — endocrine disruption and estrogen receptor agonism at low concentrations; (2) sulfate surfactants (SLS, SLES) contaminated with 1,4-dioxane (a probable carcinogen); (3) synthetic fragrance masking dozens of undisclosed compounds; (4) DMDM hydantoin and other formaldehyde-releasing preservatives.

What's in it

Click any compound name for its full safety profile, regulatory consensus, and exposure data.

Who's most at risk

• Pregnant Women — Dermal absorption of endocrine disruptors; fetal exposure
• Children — Thinner skin, higher surface-area-to-body-weight ratio

How to use it more safely

• Apply to wet hair and massage into scalp gently
• Rinse thoroughly with clean water until product is completely removed
• Use appropriate amount for hair length and thickness
• Use as directed on product label

Red flags — when to walk away

• Product contains DMDM hydantoin or imidazolidinyl urea in ingredient list — These are formaldehyde-releasing preservatives — they slowly release formaldehyde into the product and onto the scalp during use. Formaldehyde is IARC Group 1.
• Product contains 'fragrance' without further specification — Generic 'fragrance' can include musks, phthalates (DEP as fixative), allergens, and other undisclosed compounds. Synthetic fragrance in daily-use rinse-off products contributes to cumulative exposure.
• Children's shampoo with fragrance, SLS, or parabens — Children's skin is more permeable; daily scalp exposure to endocrine-active compounds (parabens, phthalate fragrance components) during development warrants particular caution.

Green flags — what to look for

• EWG Skin Deep score 1–2 with full ingredient disclosure — Low hazard score covering all disclosed ingredients. Requires full ingredient transparency.
• Made Safe Certified — Third-party ingredient-level screening against a database of known harmful ingredients including parabens, formaldehyde releasers, and concerning fragrance components.
• COSMOS Organic / COSMOS Natural certified — European standard requiring specific approved ingredient lists and prohibiting petrochemical surfactants and synthetic preservatives.

Safer alternatives

• Natural/organic shampoo and conditioner — Free from synthetic chemicals and harsh sulfates; gentler on scalp
• Sulfate-free shampoo and conditioner — Reduces irritation risk and is gentler for sensitive scalps

Frequently asked questions