Propylene Glycol Alginate

What is Propylene Glycol Alginate?

Propylene Glycol Alginate is a semi-synthetic derivative created by esterifying alginic acid, a polysaccharide extracted from brown seaweeds such as kelp or Laminaria species. This marine-sourced polymer is commonly used in skincare creams, lotions, gels, makeup, and hair products. It functions by forming viscous solutions and gels at low concentrations, which helps control product thickness for easy application and even distribution. As a stabilizer, it prevents phase separation in emulsions and suspensions, maintaining uniformity over time. In powdered or solid formats, it promotes adhesion among particles, boosting structural integrity. Its mild, water-soluble nature allows it to integrate seamlessly without altering skin feel, while supporting even dispersion of active components and scents. This makes it valuable in water-based formulas requiring reliable performance across temperature changes.

Comedogenic Rating 0/5 Low risk of clogging pores

EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Binder

Helps hold solid ingredients together to form cohesive tablets, compacts, or sticks, improving pressability, integrity, and wear of the finished product.

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.

Binding

Provides cohesion by helping ingredients stick together, improving the strength and integrity of pressed powders, tablets, or solid bars.

Benefits

Provides smooth, stable textures for comfortable application.

Strengthens solid products like powders for better wear.

Maintains formula uniformity, preventing separation.

Who It's For

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

Who May Benefit	Who Should Avoid
People using lotions or creams for consistent feel.	Individuals with rare seaweed allergies.
Those applying makeup needing durable, cohesive finishes.	People sensitive to alginate derivatives.
Users of gels or serums wanting reliable thickness.	Those avoiding marine-sourced polymers.

Safety Notes

Low hazard rating from safety assessments.
Minimal irritation potential in cosmetic use.

Frequently Asked Questions about Propylene Glycol Alginate

What is Propylene Glycol Alginate made from?

It comes from alginic acid in brown seaweeds, esterified with propylene glycol.

Is it irritating to skin?

Evidence shows low irritation potential in cosmetics.

What products use it?

Common in creams, gels, makeup powders, and lotions for texture control.