SLS Explained: What It Is and Why It’s So Controversial

If you’ve ever looked at the ingredient list on a bottle of shampoo, body wash, or toothpaste, chances are you’ve come across Sodium Lauryl Sulfate (SLS). It’s one of the most common cleansing agents in personal care products, but it’s also one of the most controversial. So, what exactly is SLS, and should you avoid it? Let’s break it down.

What is SLS?

Sodium Lauryl Sulfate is a synthetic surfactant—a fancy term for an ingredient that helps water mix with oil and dirt, making it easier to wash away. It’s widely used because it’s effective, inexpensive, and creates that satisfying foamy lather that many people associate

with cleanliness.

SLS is derived from petroleum or plant sources such as coconut or palm oil. The production process involves sulfation, neutralization, and purification, which transforms the raw material into a highly effective detergent.

It is used in a wide variety of products, including:

• Shampoos and conditioners

• Toothpaste

• Body washes and facial cleansers

• Dishwashing liquids

• Household cleaning products

The Concerns Surrounding SLS

Despite its effectiveness, SLS has gained a bad reputation over the years. Here’s why:

1. Skin Irritation

SLS is known as an anionic surfactant, which means it has a strong cleansing ability. However, it can also strip away natural oils from the skin, leading to dryness, irritation, and inflammation.

Studies show that SLS can disrupt the skin’s lipid barrier, which helps retain moisture and protect against bacteria. This makes it particularly problematic for individuals with:

• Eczema – SLS can exacerbate symptoms, leading to more redness and itching.

• Sensitive skin – Even at low concentrations, some people experience burning, itching, or redness.

• Rosacea – SLS can trigger flare-ups by increasing skin sensitivity.

  
  

2. Disrupts the Skin Barrier

Overuse of SLS-based products can weaken the skin’s natural defences, making it more susceptible to external irritants, bacteria, and allergens. A compromised skin barrier can result in:

• Increased transepidermal water loss (TEWL), leading to chronic dryness.

• Heightened sensitivity to environmental pollutants and allergens.

• A greater likelihood of breakouts and inflammation.

3. Harmful to the Environment

SLS is often derived from palm oil, contributing to deforestation and habitat destruction. In addition, SLS does not biodegrade easily and can have a lasting impact on aquatic ecosystems. When washed down the drain, it can:

• Accumulate in waterways, affecting marine life by disrupting cell membranes in aquatic organisms.

• Contribute to water pollution, leading to reduced water quality and ecological imbalance.

• Hinder natural biodegradation, increasing the environmental footprint of personal care products.

Natural Alternatives to SLS

For those looking to avoid SLS, there are plenty of gentle, natural alternatives available:

• Clay-Based Cleansers – Ingredients like Kaolin and Bentonite clay act as natural detoxifiers, absorbing excess oil while maintaining skin hydration. These are excellent for deep cleaning without irritation.

• Soap-Based Cleansers – True soap, made through saponification of nourishing oils, offers a mild but effective way to cleanse. Look for cold-processed natural soaps that retain beneficial glycerin for extra hydration.

• Aloe Vera & Botanical Extracts – Nature’s answer to harsh detergents! Aloe vera, chamomile, and green tea extracts gently cleanse while providing soothing and moisturizing benefits for the skin.

Why Fokus Stays Away from SLS

At Fokus, we’re committed to natural, skin-friendly formulations that support both your well-being and the environment. That’s why we never use SLS in our soaps or skincare products. Instead, we rely on high-quality plant-based oils, butters, and gentle cleansers to nourish your skin while effectively cleansing it.

Should You Avoid SLS?

While some people may tolerate SLS without noticeable issues, it’s worth considering the potential downsides. SLS can be harsh on the skin, disrupting the natural barrier and leading to irritation over time. Even if you don’t have sensitive skin, prolonged exposure to strong detergents may contribute to dryness and discomfort.

From an environmental perspective, SLS isn't the most sustainable option, as it can contribute to water pollution and deforestation through palm oil sourcing. Choosing SLS-free alternatives allows you to opt for gentler, eco-conscious choices that are just as effective—without unnecessary risks.