The Lab
Specimen No. 0108
ClearedDerivedcleaning agentsurfactant

Castile Soap

castile soap · dr bronners · pure castile

Plant-oil based soap made without synthetic detergents. Biodegradable, free of synthetic preservatives and fragrances, and effective for cleaning. One of the cleanest surfactant options.

high confidence
Researched April 18, 2026

Concerns

  • Alkaline pH can leave residue on certain surfaces (hard water scaling)
  • May dry skin with very frequent use — follow with moisturizer
  • Highly concentrated — dilution required for most uses

Sourcing & processing

plant derivednaturally sourced

Commonly found in

Multi-purpose cleanerBody washShampooDish soapPet wash

Research disclaimer: This rating is based on available peer-reviewed research and regulatory assessments at the time of publication. It is not medical advice. Consult a qualified professional for personal health or skin concerns.

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