Question 1

What does SLS/SLES do in a cosmetic formula?

Accepted Answer

This ingredient is an anionic surfactant used primarily for foaming, cleansing, and oil removal in rinse-off products such as shampoos, body washes, and facial cleansers.

Question 2

Is SLS/SLES clean?

Accepted Answer

Clean-beauty frameworks often flag it because it can be drying or irritating, especially at higher use levels or in formulas with limited barrier-supporting ingredients. The ethoxylated form also carries a processing-residue concern around 1,4-dioxane control.

Question 3

Is SLS/SLES sustainable?

Accepted Answer

This material is typically made from fatty alcohol feedstocks that may be coconut, palm, petroleum-derived, or mixed. It is generally biodegradable in wastewater conditions, but high-volume rinse-off use and palm supply-chain traceability are relevant sustainability considerations.

Question 4

Is SLS/SLES COSMOS-approved?

Accepted Answer

This ingredient has mixed COSMOS alignment: the non-ethoxylated form may be permitted when sourcing and processing meet the standard, while the ethoxylated form is generally not aligned with COSMOS natural or organic rules. From a Green Chemistry view, biodegradability is a positive, while ethoxylation, residue controls, and feedstock traceability weaken the profile.

Question 5

How does SLS/SLES work chemically?

Accepted Answer

The molecule is a small anionic amphiphile with a fatty tail and a charged head group, which gives strong micelle formation, foam, and detergency. Typical rinse-off use levels vary widely, often around a few percent active matter up to the low teens, and irritation potential is strongly affected by concentration, pH, contact time, and pairing with amphoteric or nonionic co-surfactants.