What Is Sodium Trideceth-6 Carboxylate?
Sodium Trideceth-6 Carboxylate is a synthetic surfactant created by joining a tridecyl alcohol chain with six units of ethylene oxide, then adding a carboxylic acid group that is neutralized with sodium. This gives the molecule a water-loving head and an oil-loving tail, which is why it works so well in cleansers. The ingredient first appeared in the late 1980s when formulators started looking for milder alternatives to traditional sulfates. It is produced through controlled ethoxylation of tridecyl alcohol followed by carboxylation and neutralization. You will often spot it in facial cleansers, micellar waters, body washes, shampoo, bubble baths and some makeup removers where a gentle yet effective lather is desired.
Sodium Trideceth-6 Carboxylate’s Cosmetic Benefits/Uses
This ingredient pulls its weight in a formula by performing two key tasks:
- Cleansing: Its surfactant structure lifts away dirt, excess oil and product buildup so they can be rinsed off with water, leaving skin or hair feeling fresh but not stripped.
- Foaming: It helps create a soft, stable lather that spreads product evenly across the skin or scalp, improving the sensory experience and making it easier to rinse.
Who Can Use Sodium Trideceth-6 Carboxylate
Sodium Trideceth-6 Carboxylate is generally suitable for most skin types, including normal, oily and combination skin, because it removes grime without the harshness of stronger sulfates. Sensitive skin usually tolerates it well, though very dry or eczema-prone skin could feel tight if the formula is not balanced with moisturizers.
The ingredient is synthetic and does not come from animal sources, so it is considered appropriate for vegans and vegetarians.
No published data suggest any special risk for women who are pregnant or breastfeeding when this ingredient is used in wash-off products, but this is not medical advice. Anyone who is pregnant or nursing should check with a physician before starting or changing skincare routines.
Sodium Trideceth-6 Carboxylate does not increase photosensitivity, so there is no extra need for sun precautions beyond the daily SPF that dermatologists already recommend.
Potential Side Effects/Adverse Reactions
Side effects and reactions to topical Sodium Trideceth-6 Carboxylate can vary from person to person. The points below cover potential issues and are unlikely to reflect the typical experience for most users when the ingredient is properly formulated.
- Temporary dryness or tightness, especially on very dry skin
- Mild irritation or redness if skin is already compromised
- Stinging or watering of the eyes if the product accidentally gets into them
- Rare allergic contact dermatitis presenting as itching or a rash
If any of these reactions occur discontinue use and consult a medical professional or dermatologist.
Comedogenic Rating
Rating: 0–1 (very low likelihood of clogging pores)
Sodium Trideceth-6 Carboxylate is highly water soluble and designed to rinse off completely, leaving little to no residue that could block pores. It also lacks heavy oils or waxes typically linked to breakouts, so most dermatology sources classify it at the bottom of the comedogenic scale.
This makes the ingredient generally suitable for people who are prone to acne or frequent breakouts.
No notable interactions with common acne treatments or pore-clogging ingredients have been reported, but overall formula composition still matters when evaluating any finished product.
Summary
Sodium Trideceth-6 Carboxylate is a synthetic surfactant that lifts away dirt and excess sebum while creating a pleasant, stable foam. Its dual water-loving and oil-loving structure lets it wrap around oily grime so it can be rinsed clean, which explains its use in facial cleansers, micellar waters, shampoos and body washes.
Although not as famous as classic sulfates or newer glucosides, it has carved out a steady niche in gentle cleansing formulas because it balances effectiveness with mildness.
Current safety data show it is low risk when used in rinse-off products, with only occasional reports of dryness or mild irritation in very sensitive skin. As with any cosmetic ingredient it is smart to perform a quick patch test when trying a new product to confirm personal compatibility.