Algin

Benefits
RegenerationAntisepticMoisturizingSoftening

What is Algin?

Algin is a natural polysaccharide, primarily alginic acid or its sodium salt, extracted from brown seaweeds like kelp (Laminaria species). Belonging to the phycocolloid family, it appears as a white to yellowish powder soluble in water. In cosmetics, it functions across categories like creams, lotions, masks, and gels as a versatile performer. It absorbs water to swell and form thick, viscous gels, controlling product thickness for better spreadability and stability. As a binder, it holds particles together in solids; as a viscosity controller, it prevents separation; and in masking roles, it neutralizes off-odors. Its film-forming ability creates a protective layer on skin, aiding moisture retention without greasiness.

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:

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.
Masking
Reduces perception of unpleasant odors or tastes by neutralizing them or covering them with more acceptable sensory notes.

Benefits

Provides moisturizing effects by drawing and holding water on the skin.

Softens skin surface for smoother feel.

Supports regeneration and has antiseptic qualities.

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 with dry skin needing hydration.
People with oily skin, as it may exacerbate oiliness.
Those seeking softer, more supple skin texture.
Those with sensitive skin prone to reactions.
Users of thickening formulas for better product performance.
Individuals experiencing irritation from seaweed derivatives.

Safety Notes

  • Rated low hazard (EWG 1) with minimal health concerns.
  • Generally safe in cosmetics at typical use levels.

Frequently Asked Questions about Algin

What is algin derived from?

Algin comes from brown seaweeds, used as a natural thickener in skincare.

Is algin comedogenic?

It has a comedogenic rating of 0, unlikely to clog pores.

Can algin benefit dry skin?

Yes, its moisturizing properties help hydrate and soften dry skin.