What Is Myristyl Sultaine?
Myristyl Sultaine is an amphoteric surfactant made from myristic acid, a fatty acid usually sourced from coconut or palm kernel oil. Chemically known as 1-tetradecanaminium, N,N-dimethyl-N-(3-sulfopropyl)- inner salt, it carries both positive and negative charges that allow it to clean while staying gentle on skin and hair.
The ingredient was introduced to personal care labs in the late 1980s as formulators looked for milder alternatives to harsh sulfates. Its popularity grew once studies showed it could boost foam and reduce irritation when blended with other surfactants.
Manufacturing starts with myristyl dimethylamine, which is reacted with sodium 3-chloropropanesulfonate. The result is a self-neutralizing “inner salt” that does not need added acids or bases, simplifying production and improving product stability.
Today you will spot Myristyl Sultaine in shampoos, facial cleansers, body washes, micellar waters, baby baths, hand soaps, shaving creams, conditioners and even some makeup removers. Anywhere a formulator wants rich foam with a silky after-feel, this ingredient is a likely pick.
Myristyl Sultaine’s Cosmetic Benefits/Uses
Here is how this multitasker supports the performance and feel of your favorite products:
- Cleansing: Lowers surface tension so water can rinse away dirt, oil and leftover makeup without leaving skin tight or hair squeaky
- Skin Conditioning: Deposits a light conditioning layer that helps skin feel soft and hair feel smooth while cutting down on static
- Emulsifying: Helps oil and water stay blended, keeping lotions, washes and creams uniform from the first pump to the last
Who Can Use Myristyl Sultaine
Because Myristyl Sultaine is a mild surfactant it is generally well tolerated by normal, dry, oily and combination skin. Its low irritation profile also makes it a common pick for sensitive skin though anyone with a known sulfonate allergy should proceed with caution.
The ingredient is typically sourced from coconut or palm kernel oil so it is suitable for vegans and vegetarians provided the finished product is not tested on animals.
Current safety assessments show no specific risks for pregnant or breastfeeding women when the ingredient is used at the concentrations found in rinse-off or leave-on cosmetics. This is not medical advice; expectant or nursing mothers should check any skincare routine with their doctor.
Myristyl Sultaine is not known to cause photosensitivity and it does not interfere with sunscreen performance. It is also considered color-safe for dyed hair thanks to its gentle cleansing action.
Potential Side Effects/Adverse Reactions
Reactions to topical Myristyl Sultaine differ from person to person. The following points list potential side effects; most users will not experience them when the ingredient is formulated and used correctly.
- Transient stinging or burning on very sensitive skin
- Mild redness or itching
- Dryness or tightness if used in a high-foaming wash multiple times a day
- Eye irritation if product is accidentally rubbed into the eyes
- Allergic contact dermatitis in individuals sensitized to betaine or sulfonate derivatives
If any of these effects occur stop using the product and seek guidance from a healthcare professional.
Comedogenic Rating
Rating: 1/5
Myristyl Sultaine is a large, water-soluble molecule that rinses off easily and does not linger in pores, which keeps its clogging potential very low. It is primarily used in cleansers rather than heavy leave-on creams, further reducing buildup on the skin.
Suitable for acne-prone skin, though overall formula composition still matters.
As with any surfactant, excessive use of very strong foaming products can disrupt the skin barrier and trigger compensatory oil production, so balance and proper moisturization are key.
Summary
Myristyl Sultaine acts as a gentle cleanser, light conditioner and emulsifier. Its amphoteric nature lets it lift away dirt while leaving a silky finish and keeping oil-and-water mixtures stable.
Thanks to its mildness and ability to boost foam without harshness, it has become a go-to choice in shampoos, face washes and baby products, though it is not as famous as ingredients like cocamidopropyl betaine.
Current research shows it is safe for most users at cosmetic levels with only rare irritation reports. As with any new skincare product, patch test first to make sure your skin is happy with the overall formula.