What is Sulfate Checker?

Sulfate Checker is a free online tool that instantly analyzes your hair product's ingredient list to detect sulfates. Simply paste the ingredients from your shampoo, conditioner, or any hair care product, and our tool will scan for common sulfates like SLS, SLES, ALS, and more.

Whether you're following the Curly Girl Method, protecting color-treated hair, or just want gentler products, Sulfate Checker helps you make informed decisions about what goes on your hair. No sign-up required — just paste and check.

What are sulfates?

Sulfates are powerful cleansing agents (surfactants) commonly found in shampoos, body washes, and toothpaste. The most common types are Sodium Lauryl Sulfate (SLS) and Sodium Laureth Sulfate (SLES). They create the foamy lather you see when washing and are very effective at removing dirt, oil, and product buildup from hair.

Common Sulfates to Avoid:

• • Sodium Lauryl Sulfate (SLS)
• • Sodium Laureth Sulfate (SLES)
• • Ammonium Lauryl Sulfate (ALS)
• • Ammonium Laureth Sulfate (ALES)
• • Sodium Coco-Sulfate

Are sulfates bad for hair?

Sulfates can be harsh on certain hair types. They strip natural oils from hair, which can cause dryness, frizz, and breakage—especially for curly, colored, or damaged hair. However, for people with oily scalps and straight, healthy hair, sulfates in moderation are generally fine.

Who Should Avoid Sulfates:

• • People with curly or coily hair
• • Those with color-treated hair
• • Anyone with dry or damaged hair
• • People with sensitive scalp
• • Those with keratin treatments

What do sulfates do to your hair?

Sulfates open up the hair cuticle to remove dirt and oil. While this cleans effectively, it also allows moisture to escape, leaving hair dry and porous. Over time, this can weaken hair structure, increase frizz, and make hair more prone to tangling and breakage.

For color-treated hair, sulfates can strip dye faster, causing color to fade prematurely. For keratin treatments, sulfates break down the treatment, reducing its effectiveness and longevity.

What are sulfate-free alternatives?

If you want to avoid sulfates, look for shampoos with gentler cleansing agents. These surfactants clean effectively without stripping your hair's natural moisture:

Gentle Alternatives to Look For:

• • Cocamidopropyl Betaine
• • Sodium Cocoyl Isethionate
• • Decyl Glucoside
• • Sodium Lauroyl Methyl Isethionate
• • Coco-Glucoside