What Is Sodium Trideceth-7 Carboxylate?
Sodium Trideceth-7 Carboxylate is a synthetic surfactant made by linking tridecyl alcohol with seven units of ethylene oxide, then adding a carboxylate group and neutralizing it with sodium. The result is a water-soluble powder or liquid that mixes easily into cosmetic formulas. This ingredient first showed up in cleansers in the late 1990s when formulators were looking for milder alternatives to classic sulfates. Production starts with plant-derived fatty alcohols, usually from coconut or palm, which undergo ethoxylation, carboxylation and finally neutralization. Thanks to its gentle cleansing action and rich foam, it now appears in facial washes, body washes, shampoos, bubble baths, makeup removers and even some sheet mask essences.
Sodium Trideceth-7 Carboxylate’s Cosmetic Benefits/Uses
In a formula this ingredient mainly acts as a surfactant that boosts cleaning power and foam quality.
- Cleansing: Lowers surface tension so water can lift away sweat, excess oil and daily grime without stripping the skin
- Foaming: Produces a dense creamy lather that helps distribute the product evenly and gives users a satisfying sensory feel
Who Can Use Sodium Trideceth-7 Carboxylate
This gentle surfactant is generally suitable for oily, normal and combination skin since it removes excess oil without being as harsh as traditional sulfates. Sensitive or very dry skin may tolerate it, yet long contact times or high concentrations could leave these skin types feeling tight because any surfactant can disrupt the moisture barrier if overused. The ingredient is considered vegan and vegetarian friendly because its fatty alcohol backbone is typically sourced from coconut or palm plants and no animal-derived materials are required to manufacture it.
Current safety data show no specific concerns for women who are pregnant or breastfeeding when the ingredient is used in rinse-off or leave-on cosmetics at normal levels. This is not medical advice and anyone who is expecting or nursing should review all personal care products with their healthcare provider to be safe.
Sodium Trideceth-7 Carboxylate does not increase photosensitivity so it can be used morning or night without extra sun precautions beyond a daily sunscreen.
Potential Side Effects/Adverse Reactions
Side effects from topical use of Sodium Trideceth-7 Carboxylate vary from person to person. The points below cover potential reactions yet most people will not experience them when the ingredient is formulated and used correctly.
- Transient dryness or tightness after cleansing
- Mild redness or stinging in sensitive skin
- Eye irritation if the product accidentally gets into the eyes
- Rare allergic contact dermatitis presenting as itching or small bumps
If any irritation or discomfort occurs stop using the product and consult a healthcare professional for guidance.
Comedogenic Rating
Rating: 0 / 5 Sodium Trideceth-7 Carboxylate is a fully water-soluble surfactant that does not leave an oily or waxy film behind. Because it is usually found in rinse-off cleansers at low concentrations it has virtually no chance of blocking pores. For that reason it is considered safe for skin that is prone to acne or breakouts. No animal or plant oils remain in the final ingredient so there is nothing for acne bacteria to feed on.
Summary
Sodium Trideceth-7 Carboxylate is a mild synthetic surfactant that lifts dirt oil and makeup while whipping up satisfying foam. It works by lowering the surface tension of water so grime can be rinsed away easily without the harshness of classic sulfates. Although not the most talked-about ingredient it quietly appears in a fair number of modern cleansers shampoos and bubble baths because formulators value its gentleness and reliable foam.
Current safety assessments rate it as low-risk for skin sensitization or long-term toxicity. Most users can enjoy products containing it with confidence but it is always wise to patch test any new formula to rule out personal sensitivities.