SLS and SLES (Sodium Laureth Sulphate) are chemical products and not vegan or organic ingredients. Though both SLS and SLES are derived from coconut or palm oils, they have to be reacted with sulphuric acid and ethylene oxide respectively. So, comparatively SLES is a gentler ingredient of the two but when ever SLES is used, you would generally find another ingredient in the list called ‘Cocamidopropyl Betaine’ which is used to make the SLES even more milder so as to reduce irritation due to the ingredient. (source)
Thank you for writing to us. We use sodium lauryl sulfate in our solid shampoos, and we do not consider this ingredient to be a natural one. Although it does originate from coconut materials, it does undergo some changes which deem it a synthetic material by our view.We do list our full ingredients on our website, in our stores, and in our catalogue, and we aim to be as transparent as possible so that our customers can select products they feel comfortable with. Please let me know if you have any further questions or concerns and I’d be glad to help!