A very widespread and persistent internet rumor has prompted many consumers to be worried that the shampoo they are using may actually cause cancer. Here's the facts regarding the two ingredients-sodium lauryl sulfate and sodium laureth sulfate that have caused such a scare. Contrary to the rumor, sodium lauryl sulfate (SLS) and sodium laureth sulfate (SLES) are not the same ingredient. SLS is a medium to strong surfactant (a surfactant is a "surface active agent" or detergent) that, when used alone or in high concentrations, can be irritating to some skin. In these instances, SLES is often used instead of, or in conjunction with, SLS. SLES is also a surfactant, but has a different chemical structure than SLS and is considered to be a mild to medium-strength cleanser.

SLS has been safely used for over 50 years and is approved by the FDA for use in cosmetics, supplements and in certain food applications (see the U.S. Code of Federal Regulations 21 CFR 172.822). The Cosmetics Toiletries and Fragrance Association (CTFA), which serves as the cosmetic industry advisory group to the FDA, has found no evidence that either SLS or SLES is carcinogenic. The American Cancer Society and the Cosmetic Ingredient Review have also published official statements refuting any claims regarding the carcinogenicity of SLS.

Because SLS is a very effective detergent, it can be used in many applications. However, the concentration and formulation of SLS that goes into toothpaste is much different than that of an industrial strength product not intended for human consumption or contact. Manufacturers must follow the manufacturing guidelines set by FDA relevant to the intended use of the product. Because SLS and SLES have been safely used in numerous products in many different categories of skin care, cosmetics, pharmaceuticals, and foods, we feel confident that both ingredients are indeed safe and effective when used appropriately.

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