Sodium Trideceth-4 Carboxylate

What is Sodium Trideceth-4 Carboxylate?

Sodium Trideceth-4 Carboxylate is an anionic surfactant produced by ethoxylating tridecyl alcohol with four ethylene oxide units, followed by carboxylation and forming the sodium salt. This structure features a hydrophilic carboxylate group and a lipophilic alkyl chain, ideal for interacting with both water and oils in cosmetic formulations. Primarily used in rinse-off products like shampoos, shower gels, facial cleansers, and bubble baths, it functions by decreasing surface tension to enable dirt and sebum removal. It forms micelles that encapsulate impurities, allowing them to be rinsed away effectively. The moderate ethoxylation degree balances strong cleansing power with gentleness, supporting foam generation and emulsion stability. This makes it a versatile component in daily hygiene products, contributing to a luxurious lather without harshness.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Surfactant
Lowers surface tension to enable cleansing, emulsifying, and foaming; central to shampoos, body washes, and many emulsions and micellar systems.
Cleansing agent
Removes dirt, oil, and impurities by lowering surface tension and forming micelles, enabling soils to be lifted and rinsed away from skin, hair, or teeth.

Benefits

Delivers effective cleansing by trapping oils and residues for easy rinse-off.

Produces rich, stable foam enhancing the cleansing experience.

Supports formulation of mild products suitable for regular use.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals seeking gentle surfactants in daily cleansers.
Those allergic to ethoxylated ingredients.
Users preferring foaming shampoos and body washes.
People avoiding synthetic surfactants entirely.
People with non-comedogenic needs in skincare routines.
Users sensitive to anionic cleansing agents.

Safety Notes

  • Considered low hazard with minimal irritation potential in rinse-off uses.
  • Non-comedogenic, unlikely to clog pores.

Frequently Asked Questions about Sodium Trideceth-4 Carboxylate

What does it do in products?

Acts as a surfactant to lower surface tension, cleanse impurities, and create foam.

Is it irritating?

Evidence points to low irritation, especially in rinse-off formulas.

Safe for acne-prone skin?

Rated non-comedogenic, suitable for those avoiding pore-clogging ingredients.