Sodium Lauryl Sulfate

SLS (or SLES) is a surfactant.
This is the first ingredient found in almost all shampoos, it is consistently high on the list. It replaced soap in cosmetic mixtures. Apart from the soap has exactly the same properties but without the side effects and without the environmental impact.
SLS is a derivative of sulfuric acid used as a strong chemical detergent and surfactant in laboratories, car garages (to clean engines), etc. It is also found in cosmetics for humans and animals.


Sodium Laureth Sulfate is a very powerful detergent, which has long served as an industrial cleaning product. Mechanics still use it to clean car engines today. In addition, it is very inexpensive and very easy to produce.
The SLS has thus quite simply replaced, at a lower cost, soap in preparations intended for intensive surface cleaning as in chemical laboratories.

Other names

Sodium Laureth Sulfate ; Sodium Lauryl Sulfate ; Laurylsulfate de Sodium ; SLS ; Empicol ESB 70 ; Ifrapon LOS ; Steol-130, 230, 270, 330, 370 ou 460 ; Stepanol ; Ammonium lauryl sulfate

Side effects

The laboratories consider that its handling is delicate and requires the greatest precaution and especially the adequate protection. Despite this, it is found in many products that come into direct contact with our skin and hair.
According to the studies carried out, it has been proven that its frequent use eliminates the protection of the skin and exposes it to diseases. Used in shampoos, it weakens the scalp, promotes the formation of dandruff, causes irritation, itching, tangles the hair, makes them split and can even lead to hair loss (the last straw!). Unfortunately, sodium laureth sulfate is also absorbed by the body and then acts as an endocrine disruptor, the consequences of which can be serious: premenstrual syndrome and symptoms of menopause, decline in male fertility, female cancers, including breast cancer.
The use of sodium laureth sulfate is particularly not recommended in children. Indeed, its cutaneous application can affect the development of the eyes with irreversible damage.



In the grooming environment

SLS is not recommended for DAATA groomers due to the many side effects it has for groomers, pets and environment.
In the event that you use an SLS-based product, be aware that shampoo contains around 30% surfactant (sometimes more). This means that for safe skin use a 1:30 dilution is required.
DAATA-ICDG strongly encourages any groomer to wear chemical resistant gloves when using any grooming product, regardless of composition.

For pets, SLS and SLES promote mosaic shedding and thinning of the fur. It is not recommended for frequent use and in high concentrations. A dilution of at least 1:30 is recommended.

It is impossible to limit or prevent the risks of SLS on fauna, especially aquatic fauna. In fact, aquatic organisms cannot evacuate SLS from their organism, which then leads to sterility and death.


JOURNAL OF THE AMERICAN COLE OF TOXICOLOGY Volume 2, Number 7, 1983 Mary Ann Liebert, Inc., Publishers, “Final Report on the Safety Assessment of Sodium Lauryl Sulfate

Br J Dermatol. 2006 Apr;154(4):651-7. Variation in barrier impairment and inflammation of human skin as determined by sodium lauryl sulphate penetration rate. de Jongh CM1, Jakasa I, Verberk MM, Kezic S.,

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