What Is Sodium Lauroyl Hydroxypropyl Sulfonate?
Sodium Lauroyl Hydroxypropyl Sulfonate is a mild surfactant made from natural fatty acids found in coconut and palm oils combined with plant derived propylene glycol and a sulfonate group. Chemically it is known as sodium 2 hydroxy 3 dodecanoyloxypropanesulfonate. This structure gives it a water loving end and an oil loving end so it can lift dirt and oil from skin and hair.
The ingredient was first introduced in the early 2000s as formulators searched for gentler alternatives to traditional sulfates like sodium lauryl sulfate. By tweaking the fatty acid chain and adding the hydroxypropyl sulfonate group scientists achieved a cleanser that generates creamy foam without the strong stripping effect older surfactants can have.
Manufacturing starts with lauric acid from coconut or palm kernel oil. The acid is reacted with epichlorohydrin to attach the hydroxypropyl group then neutralized with sodium bisulfite to create the sulfonate salt. The result is a biodegradable powder or paste that easily dissolves in water.
You will most often see Sodium Lauroyl Hydroxypropyl Sulfonate in sulfate free shampoos, body washes, facial cleansers, baby washes, micellar waters and foaming bath products. It also appears in solid shampoo bars and some gentle exfoliating scrubs where a soft foam is desired.
Sodium Lauroyl Hydroxypropyl Sulfonate’s Cosmetic Benefits/Uses
This ingredient is prized for the way it cleans without upsetting the skin barrier.
Function: Cleansing. As a surfactant it lowers the surface tension of water so oils, makeup, sunscreen and daily grime can be rinsed away easily. It produces a lush stable lather that helps spread the product evenly. Because it has a larger molecular size than harsh sulfates it is less likely to penetrate too deeply into the skin or hair shaft which makes it suitable for sensitive skin formulas and color safe shampoos. Its mild nature also means it pairs well with conditioning agents allowing brands to create one step wash products that leave skin soft and hair manageable.
Who Can Use Sodium Lauroyl Hydroxypropyl Sulfonate
This gentle cleanser suits most skin types including sensitive, dry, oily and combination because it removes grime without stripping the natural moisture barrier. People with very reactive or allergy prone skin may still prefer to trial products that contain it in a small area first as any surfactant can cause irritation for those individuals.
The ingredient is made from coconut or palm sources and contains no animal derived materials so it is considered vegan and vegetarian friendly. As always check the finished product label to confirm the brand’s full supply chain and animal testing stance.
Current safety data shows no specific risks for pregnant or breastfeeding people when the ingredient is used in rinse off or leave on cosmetics. This is not medical advice and anyone who is expecting or nursing should ask their doctor before starting a new skincare routine to stay on the safe side.
Sodium Lauroyl Hydroxypropyl Sulfonate does not make skin more sensitive to sunlight so it will not raise the chance of sunburn. It is also color safe for dyed hair and is biodegradable which appeals to those looking for gentler options on both skin and the environment.
Potential Side Effects/Adverse Reactions
Responses to topical Sodium Lauroyl Hydroxypropyl Sulfonate differ from person to person. The points below outline potential effects yet most users will not notice any problems when the ingredient is used correctly in a well formulated product.
- Mild skin redness or stinging – can occur if the product is left on the skin for an extended period or used on already compromised skin
- Dryness or tight feeling – possible in very dry climates or when combined with other strong actives that pull moisture from the skin
- Eye irritation – may happen if shampoo or cleanser gets into the eyes during use
- Allergic contact dermatitis – rare but possible in individuals with specific sensitivities to surfactants
If any of these reactions appear stop using the product and consult a healthcare professional if symptoms persist or worsen.
Comedogenic Rating
Rating: 0 / 5. Sodium Lauroyl Hydroxypropyl Sulfonate sits on the surface of skin then rinses away, and its molecule is too large to lodge inside pores. It does not leave an oily film that could trap dead cells or bacteria, so it is considered non comedogenic.
Because of this low risk of pore clogging the ingredient is typically fine for people who are prone to acne or frequent breakouts.
If used in a leave on formula the overall product still relies on other ingredients to stay acne friendly, but the surfactant itself is not a concern.
Summary
Sodium Lauroyl Hydroxypropyl Sulfonate is a mild plant based surfactant that cleanses by surrounding dirt and oil so water can wash them away. Its balanced structure lets it whip up a creamy foam without stripping skin or hair of natural moisture.
The ingredient is gaining traction as brands move toward sulfate free lines, yet it is not as widely known as older cleansers like sodium lauryl sulfate. Those who discover it often stick with it for its gentle feel.
Current research and years of cosmetic use point to a strong safety record with only rare irritation. Still, faces and scalps vary, so it is smart to patch test any new product that contains it before full use.