Ingredient

Sodium Lauryl Sulfate (SLS)

Flagged in 7

What is Sodium Lauryl Sulfate (SLS)?

Sodium Lauryl Sulfate (SLS) is a synthetic detergent and surfactant commonly used in personal care products. It is derived from the fatty acids of coconut oil or palm kernel oil and is used to create a lathering effect for cleaning.

SLS is primarily used in products like shampoos, body washes, and toothpastes due to its ability to break down oils and dirt, making them easier to wash away. There is mixed evidence about its safety; while it's typically considered safe for use in cosmetics and personal products, some people report skin irritation with prolonged exposure.

When you see Sodium Lauryl Sulfate on a label, it could indicate a product that is designed to deeply cleanse or foam. If you have sensitive skin, you might want to test the product on a small area first.

Commonly found in: Shampoos, Body Washes, Toothpastes, Facial Cleansers, Bubble Baths

What to watch

SLS can cause skin irritation in some individuals, especially with prolonged exposure.
It may contribute to eye irritation if used improperly.

Benefits

Effectively removes oils and dirt, providing a thorough clean.

FDA

Sodium Lauryl Sulfate is permitted for use in cosmetics and personal care products in the U.S. without specific restrictions.

Research

While effective as a cleansing agent, studies have shown it may cause irritation in some individuals, with sensitivity varying widely among users.

Vegan

Sodium Lauryl Sulfate is not derived from animal products, and it is typically considered vegan-friendly.

Sources: Cosmetic Ingredient Review

Scout's take

The most aggressive mainstream surfactant; primary skin/scalp irritant. Unusual choice for a brand marketed as 'naturally derived' -- most clean brands use coco-glucoside or decyl glucoside. Despite the 'denotes plant or mineral origin' asterisk, plant-derived SLS is chemically identical to petroleum-derived SLS in irritation potential.

More from Scout's analyses

The most aggressive mainstream surfactant; primary skin/scalp irritant. EWG 1-2 for environmental persistence but 3 for human irritation.

from the analysis of Head & Shoulders Classic Clean Daily Shampoo

The most aggressive mainstream surfactant; primary skin/scalp irritant. Combined with SLES creates the harshest commercial cleansing system in widespread use.

from the analysis of L'Oréal Paris Elvive Hyaluron + Plump 72H Hydrating Shampoo