Triethylene Glycol

What is Triethylene Glycol?

Triethylene glycol is a clear, nearly odorless liquid polyether compound derived from ethylene oxide polymerization, with the chemical structure HO(CH₂CH₂O)₃H. It belongs to the alkylene glycol family and is widely synthesized for industrial and cosmetic applications. In skincare and personal care formulations, it acts as a versatile solvent, dissolving both water-soluble and oil-soluble ingredients to create homogeneous mixtures and stable emulsions. As a viscosity controlling agent, it modulates product thickness, ensuring optimal flow, spreadability, and suspension of particles in creams, lotions, and gels. It also contributes to fragrance systems by masking base odors and stabilizing scents. Typically used in low concentrations, its hygroscopic nature supports formulation integrity without altering skin feel significantly, making it suitable for various product types like shampoos, perfumes, and moisturizers.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1-4 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Fragrance ingredient
Contributes scent character and/or masks base odors, shaping the overall sensory experience of the formula (subject to allergen and IFRA considerations).
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.
Masking
Reduces perception of unpleasant odors or tastes by neutralizing them or covering them with more acceptable sensory notes.
Solvent
Dissolves and carries other ingredients, helping control viscosity, evaporation rate, and delivery of actives in both water- and oil-based systems.

Benefits

Facilitates even blending of diverse ingredients for stable, uniform products.

Adjusts consistency for smooth application and enhanced user experience.

Neutralizes off-odors while supporting pleasant fragrance delivery.

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 preferring non-comedogenic formulas for acne-prone skin.
People with glycol sensitivities or allergies.
Users of textured products like lotions needing reliable spreadability.
Individuals seeking entirely natural or plant-derived ingredients.
Those enjoying scented cosmetics with consistent aroma profiles.
Users with highly reactive skin preferring minimal synthetic additives.

Safety Notes

  • Considered safe for cosmetic use within typical concentration limits by cosmetic review panels.
  • Displays low comedogenic potential, unlikely to contribute to pore clogging.

Frequently Asked Questions about Triethylene Glycol

What does triethylene glycol do in skincare?

It dissolves ingredients, controls thickness, and masks odors for stable, smooth formulations.

Is triethylene glycol comedogenic?

No, it has a comedogenic rating of 0, suitable for pore-conscious routines.

How safe is it for daily use?

Rated low to moderate hazard by EWG (1-4), safe as used in cosmetics per reviews.