Sodium Lauryl Sulfate vs Sodium Methyl Cocoyl Taurate: which is worse?

What is Sodium Lauryl Sulfate?

Sodium lauryl sulfate is an anionic surfactant derived from lauryl alcohol (from coconut or palm oil). It is one of the oldest and most-studied cosmetic surfactants, prized for its powerful foaming and degreasing properties. Unlike SLES, it is not ethoxylated.

What is Sodium Methyl Cocoyl Taurate?

Sodium methyl cocoyl taurate is an anionic acyl taurate surfactant derived from coconut oil and taurine (an amino sulfonic acid). It produces a fine, stable foam and is known for its very low irritation potential and excellent skin feel.

Documented risks

Sodium Lauryl Sulfate: SLS is safe at cosmetic use concentrations per the CIR Expert Panel. It is more irritating than SLES to skin and mucous membranes, particularly at concentrations above 2% with prolonged contact; this is why most rinse-off products keep it at 1–2% or opt for SLES. It can disrupt the skin barrier transiently, which is why some people with canker sores or eczema avoid SLS toothpastes and cleansers. It is not carcinogenic, not a hormone disruptor, and is not absorbed systemically in meaningful amounts. It biodegrades rapidly in the environment.

Sodium Methyl Cocoyl Taurate: Sodium methyl cocoyl taurate has a very good safety profile with minimal irritation or sensitization potential. No carcinogenic, mutagenic, or reproductive toxicity concerns are documented. It is broadly compatible with skin microbiome health and does not significantly disrupt the skin barrier.