SLS/SLES — the harsh foam, and a 1,4-dioxane risk.
Sodium lauryl/laureth sulfate (SLS/SLES) create the rich foam in many shampoos and washes, but are a standard benchmark for skin irritation; the ethoxylated form (SLES) can also carry trace 1,4-dioxane. Our certified-organic washes foam with plant-based APG instead — gentler, and free of that contamination risk.
Source: IARC Monograph — 1,4-dioxane ↗