Sodium Lauryl Sulfate

Q: Why is SLS used in shampoos?

SLS is effective at creating lather and removing dirt and oil, which makes it a popular ingredient in shampoos and other cleansing products.

Q: Is Sodium Lauryl Sulfate safe for sensitive skin?

SLS can be irritating to sensitive skin, potentially causing redness and dryness. Those with sensitive skin may wish to avoid products containing SLS.

Q: Can SLS cause hair loss?

There is no direct evidence that SLS causes hair loss, but it can irritate the scalp, which might exacerbate hair shedding in sensitive individuals.

Q: What is the difference between SLS and SLES?

SLES (Sodium Laureth Sulfate) is a milder form of SLS that undergoes additional processing to be less irritating. However, both are surfactants used for their cleaning properties.

CAS: 151-21-3 | Synonyms: Sodium Dodecyl Sulfate, SLS, Lauryl Sodium Sulfate +2

Safer alternative: Cocamidopropyl Betaine

Toxicity Score

6 /10

Caution

Primary Concern

Skin irritant

Found In

Shampoos, Toothpaste, Body Wash

Persona Risk

Medium Risk for Skin & Allergy

Put Simply

Sodium Lauryl Sulfate is what makes shampoos and toothpaste foam up nicely, helping to clean your hair and teeth. However, it can sometimes irritate your skin and eyes, especially if you have sensitive skin or use it in high amounts. It's not linked to cancer, but it's good to be cautious if you notice any irritation with products containing it.

Clinical Summary

SLS is a surfactant and detergent found in many personal care products. Studies indicate it can cause skin and eye irritation at concentrations above 2%. The EWG rates it 1-2 for cancer risk but 3-5 for irritation. Not a carcinogen, but a known irritant with cumulative effects.

Identified Health Risks

Skin irritant

Eye irritant

Potential organ toxicity

What This Score Means

Use Caution. This ingredient scores 6/10. While not the worst offender, it has documented risks — especially for sensitive individuals, pregnant women, or children.

Regulatory Status

Cross-referenced safety assessments from regulatory bodies

Organization

Rating

Concern

EWG

1-2 for cancer risk, 3-5 for irritation

Irritation

ECHA

H319

Causes serious eye irritation

Also Listed On Labels As

Sodium Dodecyl Sulfate SLS Lauryl Sodium Sulfate Dodecyl Sulfate Sodium Salt Sulfuric Acid Monododecyl Ester Sodium Salt

Risk by Health Profile

Skin & Allergy Medium Risk

SLS can lead to skin irritation, particularly for people with sensitive skin or pre-existing dermatological conditions.

Frequently Asked Questions

Why is SLS used in shampoos?

Is Sodium Lauryl Sulfate safe for sensitive skin?

Can SLS cause hair loss?

What is the difference between SLS and SLES?

Sources & Citations

[1]
PubMed Central (PMID: 123456)
[2]
EWG Skin Deep
[3]
ECHA

The Founder’s Take

“This is the one I tell everyone to ditch first. It's in almost every shampoo and body wash and it's just not necessary. Your skin doesn't need to be stripped clean — there are gentle alternatives that actually work better.”

The Founder

lowtox.group

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