Peppermint Pure-Castile Liquid Soap
Lower concern. Simple soap formulation without known PFAS sources.
Dr. Bronner's Peppermint Castile Soap is a plant-based liquid soap with no known fluorinated ingredients or water-repellent treatments. No PFAS disclosure or testing data available, but formula composition presents lower concern.
We flunk more products than we pass. This one earned its grade. How we grade
Material
water, plant oils, potassium hydroxide
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Peppermint Pure-Castile Liquid Soap is made of, ingredients and materials
Dr. Bronner's Peppermint Pure-Castile soap is formulated from saponified plant oils (coconut, palm, olive, jojoba, hemp), water, and potassium hydroxide, a base used to convert oils into soap. This is classical cold-process or hot-process saponification; no synthetic surfactants, binders, or coatings are involved. Potassium hydroxide is fully consumed in the saponification reaction and does not remain as a free chemical in the finished product. The peppermint ingredient is likely an essential oil or extract, which contributes fragrance and antimicrobial properties but is present in low concentration in a rinse-off product.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Fragrance allergens (peppermint essential oil)
Peppermint essential oil contains menthol and limonene, which are known allergens in sensitive individuals. Incidence of contact sensitization is low but documented, especially with repeated exposure on skin or inhalation. Rinse-off products pose lower risk than leave-on products.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Formaldehyde / VOCs
No preservatives known to release formaldehyde (e.g., DMDM hydantoin, imidazolidinyl urea) are listed on available ingredient disclosures for this product. Not expected in a simple soap formulation.
Source, ATSDR ↗1,4-Dioxane contamination
This contaminant is typically present only in products containing ethoxylated ingredients (e.g., polysorbates, cetyl alcohol ethoxylates). Dr. Bronner's formulation does not list such ingredients, making 1,4-dioxane contamination unlikely, though no third-party testing results are publicly available for verification.
Heavy metals
This product contains no pigments or colorants listed in available ingredient information. Not a relevant concern for this formulation.
Source, FDA ↗Talc contamination
Talc is not an ingredient in liquid soap formulations. Not applicable to this product category.
How is this PFAS grade calculated?
The brand's record and disclosure
Dr. Bronner's publishes a detailed ingredient list on packaging and online, with no known history of undisclosed ingredients or voluntary recalls for chemical contamination. The brand does not widely promote third-party certifications (e.g., EWG Verified, USDA Organic for cosmetics), though some formulations carry Fair Trade and Non-GMO Project verification. No major chemical controversies or enforcement actions against the brand for this product line have been established in public records. The company's stance on PFAS is not explicitly stated, but the simple formulation (water, plant oils, base) contains no known intentional PFAS sources.
How it compares in its category
Liquid hand and body soaps vary widely. Mass-market products often contain synthetic surfactants, preservatives (parabens, methylisothiazolinone), and fragrance blends that may include undisclosed allergens or trace contaminants. Dr. Bronner's Peppermint avoids synthetic surfactants and commonly flagged preservatives, relying instead on the antimicrobial nature of soap itself and the peppermint essential oil. It is generally considered a simpler formulation than mainstream liquid soaps, with fewer synthetic additives, though not necessarily lower-cost per use.
If you buy it
Liquid castile soap is concentrated; dilute per label instructions (typically 1:10 with water) to extend use and reduce waste. Store in a cool, dry place away from direct sunlight to preserve potency; essential oils can degrade over time with heat or light exposure. Like all soaps, it will leave mineral deposits on skin if used with hard water; rinse thoroughly. The product is not harmful if ingested in small amounts, but is not intended for ingestion; keep out of reach of children and use as directed.
What is not known about PFAS in this product?
- Basis
- Model estimate, 85% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Dr. Bronner's has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to Peppermint Pure-Castile Liquid Soap?
- soluble tablet, plant-based surfactants
- A third party reports verifying it as PFAS-free
- Fragrance allergens and sensitizers
2 hazards checked on this product, all on its full breakdown.
More hand soap grades
How we score, every product runs through the same public 0-100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.