Sodium Isethionate: What Is It, Cosmetic Uses, Benefits & Side Effects

Curious about this ingredient? In this article we're explaining exactly what it is and why it's used within cosmetic formulations.
Updated on: June 30, 2025
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We verify all information on this page using publicly available nomenclature standards from The Personal Care Products Council (PCPC), the European Commission's CosIng database and documentation provided directly by ingredient manufacturers. Our analysis is based on technical data from these sources to ensure accuracy and reliability.

What Is Sodium Isethionate?

Sodium isethionate, also known as sodium 2-hydroxyethanesulphonate, is a mild, water-soluble salt derived from isethionic acid. The ingredient is often created by reacting ethylene oxide with sodium bisulfite, then neutralizing the resulting mixture. This process yields a white, crystalline powder that dissolves easily in water and stays stable across a wide range of pH levels.

The compound first drew attention in the mid-20th century when formulators searched for gentler alternatives to traditional sulfates. Its excellent solubility, low irritation potential and ability to create a rich lather made it a natural fit for personal-care products. Over time it became a staple in soap-free cleansing bars known as syndet bars, as well as in liquid cleansers.

Today sodium isethionate appears in a variety of cosmetics, including shampoos, body washes, facial cleansers, shaving creams, bath bombs, bubble bars, solid shampoo bars, gentle baby washes and pet-care cleansers. Its versatility lets brands offer milder formulas that still cleanse effectively without stripping skin or hair.

Sodium Isethionate’s Cosmetic Benefits/Uses

In formulations sodium isethionate serves several helpful roles:

  • Antistatic: Helps reduce static buildup on hair strands so styles stay smooth and manageable.
  • Cleansing: Produces a creamy lather that lifts away dirt, oil and product residue while remaining gentle on skin and scalp.
  • Hair conditioning: Leaves a soft feel after rinsing which can enhance slip, making detangling easier.
  • Skin conditioning: Helps maintain skin’s moisture balance so cleansers feel less drying and more comfortable for daily use.

Who Can Use Sodium Isethionate

Sodium isethionate is considered gentle enough for most skin types, including dry, normal, combination and oily skin. People with very sensitive or compromised skin usually tolerate it well because it cleanses without stripping natural oils. It is not known to aggravate acne or rosacea, and it does not clog pores, making it suitable for blemish-prone skin. There are no specific skin types that must avoid it unless an individual has a personal sensitivity to the ingredient.

The compound is made synthetically from mineral-derived raw materials, so it contains no animal products or by-products. For that reason it is generally accepted by both vegetarians and vegans.

Current research has not linked topical sodium isethionate to any risks during pregnancy or while nursing. Still, this information is educational only, not medical advice, and anyone who is pregnant or breastfeeding should run any skincare products past a qualified doctor just to be safe.

Sodium isethionate does not make skin more sensitive to sunlight, so there is no added risk of photosensitivity when using products that contain it. It also has no known interactions with common skincare actives such as retinol, vitamin C or exfoliating acids, which allows it to fit easily into most routines.

Potential Side Effects/Adverse Reactions

Reactions to topical sodium isethionate can differ from one person to another. The effects listed below are possible but uncommon, and most users will not experience them when the ingredient is used at appropriate levels in a well-formulated product.

  • Mild skin irritation such as slight redness or stinging
  • Dryness or tightness if the formula lacks added moisturizers
  • Allergic contact dermatitis in individuals sensitive to the ingredient
  • Eye irritation if the product accidentally gets into the eyes

If any discomfort or reaction occurs stop using the product and seek advice from a healthcare professional.

Comedogenic Rating

Rating: 0 / 5

Sodium isethionate is a small, highly water-soluble molecule that rinses away completely and leaves no oily film on skin. Because it does not linger in pores or add any occlusive residue, it does not promote blackheads or blemishes. Its primary role in formulas is cleansing rather than emolliency, which further lowers any clogging potential.

Suitability for acne-prone skin: yes, products with sodium isethionate are generally safe for people who are prone to breakouts.

Since the ingredient is almost always used in wash-off products like bars and liquid cleansers, skin contact time is brief, making the risk of pore blockage even lower.

Summary

Sodium isethionate acts as a gentle cleanser, antistatic agent, hair conditioner and skin conditioner. It dissolves quickly in water, creates a creamy lather that lifts away dirt and oil, leaves hair smoother and helps skin feel soft rather than stripped.

Its mild nature has made it a favorite in syndet bars, solid shampoo bars and sulfate-free liquid washes, especially among brands looking to offer kinder alternatives to harsher surfactants. While it may not be as famous as ingredients like sodium lauryl sulfate, its popularity is steadily growing in the clean and sensitive-skin segments.

Overall safety is high with very low irritation and no evidence of systemic concerns. As with any new skincare item, it is wise to do a quick patch test when you try a product containing sodium isethionate, just to be sure your skin agrees with it.

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