What Is Sodium Trideceth-3 Carboxylate?
Sodium Trideceth-3 Carboxylate is a synthetic surfactant made by reacting tridecyl alcohol with ethylene oxide to create a short chain of three ethoxy units, then adding a carboxyl group and neutralizing it with sodium. This gives the ingredient a gentle soap-like head and a water-loving tail, letting it mix oil with water. It first showed up in personal care labs in the late twentieth century when chemists were searching for milder alternatives to classic sulfates. Today it is produced in large batches through controlled ethoxylation followed by carboxylation, steps that allow good quality control and low impurity levels. You will spot it in face and body washes, liquid hand soaps, micellar waters, bubble baths, shampoo blends, shaving foams and some makeup removers because it cleans well without stripping skin or hair.
Sodium Trideceth-3 Carboxylate’s Cosmetic Benefits/Uses
Here is what this ingredient adds to a formula
- Cleansing: Lifts away sweat, oil and product buildup so they rinse off easily with water which leaves skin and hair feeling fresh
- Foaming: Creates a stable lather that spreads the cleanser over the surface evenly helping users feel the product working while improving rinse-off
Who Can Use Sodium Trideceth-3 Carboxylate
This mild surfactant is generally suitable for normal, oily and combination skin because it removes grime without leaving a heavy residue. People with sensitive skin typically tolerate it well thanks to its low irritation profile, though those with very dry or compromised skin barriers might find frequent use a bit drying if a formula lacks replenishing ingredients.
Sodium Trideceth-3 Carboxylate is entirely synthetic and contains no animal-derived materials so it aligns with vegan and vegetarian preferences.
No specific concerns have been flagged for pregnant or breastfeeding women when the ingredient is used in rinse-off or leave-on products at industry standard levels. This is not medical advice and anyone who is expecting or nursing should review their skincare routine with a qualified healthcare provider to be safe.
The ingredient is not known to cause photosensitivity and it does not interact with sunlight in a way that would make skin more prone to sunburn. It is also free of common allergens like gluten nut proteins and soy.
Potential Side Effects/Adverse Reactions
Reactions to topical Sodium Trideceth-3 Carboxylate vary from person to person. The points below outline potential but uncommon side effects; most users will not encounter these issues when the ingredient is used at appropriate levels in a well-formulated product.
- Mild skin dryness or tightness
- Transient stinging on very chapped or broken skin
- Redness or irritation in extremely sensitive individuals
- Eye irritation if the cleanser accidentally gets into the eyes
- Rare allergic contact dermatitis presenting as itching or rash
If any of these effects occur discontinue use and consult a healthcare professional.
Comedogenic Rating
Rating: 0 / 5. Sodium Trideceth-3 Carboxylate is a fully water-soluble surfactant that does not leave a fatty residue so it cannot block pores. Its quick rinse-off profile in cleansers further lowers any clogging potential.
That means it is generally safe for skin that is prone to acne or breakouts.
Because it is almost always used in low percentages within wash-off formulas the real-world risk of comedogenicity is considered negligible.
Summary
Sodium Trideceth-3 Carboxylate works as a cleanser and foaming agent by surrounding dirt and oil then helping them mix with water so they slide off skin and hair. Its short ethoxy chain keeps it mild while the carboxylate head boosts rinse-off.
You will find it in plenty of everyday face washes shampoos and hand soaps, but it tends to fly under the radar rather than headline marketing claims.
Overall safety data rate it as low irritation and non-comedogenic though individual sensitivities can happen. Patch test any new product containing it to make sure your skin stays comfortable.