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If you have recently turned over your shampoo bottle and tried to read the ingredient list, you are not alone in finding it confusing and somewhat unsettling. The average liquid shampoo contains between 15 and 30 ingredients, most listed by their INCI names, which are designed for regulatory compliance rather than consumer understanding. This guide explains what the most common shampoo ingredients actually are, what they do, and which ones a growing body of research suggests you may want to avoid.
The first ingredient on most liquid shampoo labels is water. Conventional liquid shampoo formulas are typically 70 to 80 percent water by volume. The remaining 20 to 30 percent contains the ingredients that actually clean, condition, and treat the hair. Everything else in the formula exists to make the water-heavy base feel like a premium product, to preserve it from microbial growth, or to add colour and fragrance.
Sodium Lauryl Sulfate (SLS) and Sodium Laureth Sulfate (SLES) are the most widely used surfactants in conventional shampoo. They are aggressive anionic surfactants that produce abundant foam and effectively strip oil and dirt from the hair. They are also the subject of significant dermatological concern. Research has documented that sulfate-based surfactants strip the scalp's protective lipid barrier, creating chronic low-grade inflammation at the follicular level.
The alternative: Sodium Cocoyl Isethionate (SCI) is a coconut-derived surfactant that provides effective cleansing with a rich lather without stripping the lipid barrier. It is rated 1 by the Environmental Working Group and is widely used in dermatologist-recommended formulations for sensitive and compromised scalps.
Because liquid shampoo is 70 to 80 percent water, the base formula is thin. It does not feel like a premium product in your hand. To solve this, manufacturers add thickening agents whose sole function is to make diluted liquid feel rich and luxurious.
Water-based formulas require preservatives to prevent microbial growth. Common preservatives include parabens (methylparaben, propylparaben), which have been detected in breast tissue samples and are classified as potential endocrine disruptors by some regulatory bodies. Synthetic fragrance compounds (listed simply as Fragrance or Parfum) can contain dozens of undisclosed chemical components, some flagged as potential allergens and sensitisers.
The important context here: most of these ingredients exist because the formula is water-based. Remove the water, and you remove the need for most of the preservatives, synthetic thickeners, and stabilisers.
"So happy to finally have a shampoo and conditioner with better and more natural ingredients! I love the lather. It's better than I expected and I love how my hair feels after using it."— Margaret, Thinning Hair, Verified Buyer
"I can put both bars on at same time. I like all natural material and not plastic."— Debra, Verified Buyer
The Earthling Co. shampoo bars contain: Sodium Cocoyl Isethionate (EWG rated 1), Marshmallow Root (anti-inflammatory), Elderberry Extract (antioxidant), Panthenol (Vitamin B5), Jojoba Oil, Coconut Oil, Glycerin, Cocoa Butter. No water. No sulfates. No Carbomer. No parabens. No silicones. No synthetic polymers. No artificial fragrance.
Because there is no water in the formula, there is no need for synthetic thickeners, heavy preservatives, or the dozens of stabilising agents that water-based formulas require. Every ingredient is active. One bar lasts 80 or more washes and replaces two to three plastic bottles.
