"What’s the difference between Sodium Laureth and Sodium Laurel Sulfate? "
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Sodium Lauryl Sulfate (SLS) is a powerful and harsh surfactant (meaning that it removes sebum very effectively). Since sebum protects the skin and hair from drying out and conditions its surface, using SLS as a surfactant can lead to dry, fly-away hair and a diminished barrier property of the skin. SLS is strong enough to de-fat the skin and hair and has been shown to be quite irritating to the eyes (it can also be irritating to the skin). Sodium Laureth Sulfate (SLES) is less powerful and milder than SLS. SLES does not easily de-fat the skin and hair and has been shown to be much less irritating to the eyes.

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