Buteth-3 is a polyethylene glycol ether of butyl alcohol used in cosmetic formulations as an emulsifier, solubilizer, and surfactant to help blend oil and water phases. It functions as a base/formulation ingredient rather than a treatment active.
| Reported effect | How often | Notes |
|---|---|---|
Mild skin irritation | Uncommon | Possible transient redness or stinging, more likely on compromised or sensitive skin. |
Contact dermatitis / allergic sensitization | Rare | Reported infrequently; PEG-derived ethers are generally low sensitizers. |
Eye irritation | Uncommon | Can cause irritation on direct ocular contact with surfactant-containing products. |
Concern over ethylene oxide/1,4-dioxane impurities | Rare | Trace byproducts of ethoxylation; mitigated by purification and within regulatory safety limits. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.