Potassium Chloride

What it is

Potassium chloride is a mineral salt, the same compound sold in food as a salt substitute. In this catalogue it appears almost only on jelly and hydrogel masks, and nearly always beside a gelling seaweed gum such as Irish moss, carrageenan or agar. That pairing is the clue to what it is for: in hydrocolloid research the temperature at which kappa-carrageenan sets is governed by how much potassium chloride is present, and potassium ions are what push it into an even network. None of that work is about skin.

How it shows up on a label

What it does well

• Sets the gel a jelly mask is made of

  Carrageenan research is clear that potassium governs how kappa-carrageenan gels: the gel temperature tracks the potassium chloride concentration, and potassium drives the polymer into a more homogeneous network. That is food-hydrocolloid physical chemistry rather than a skin study, so it explains the texture of the mask in your hand and nothing beyond it.

  Moderate evidence

Worth knowing

• No cosmetic safety review of its own

  The Cosmetic Ingredient Review's published table of conclusions carries no row for potassium chloride, so there is no expert-panel wording to quote for it in cosmetics. It is a dietary mineral, and in this catalogue it usually sits below the point where ingredient order stops being meaningful.

Where the EU stands

Sources (2)

Every link goes to the original: a journal, a PubMed record or an EU document.

1. [1]
   Mixed iota and kappa carrageenan gels in the presence of both calcium and potassium ions

   Carbohydrate Polymers · 2019 · doi:10.1016/j.carbpol.2019.115107

   The gel temperature of kappa-carrageenan was determined by the potassium chloride concentration, and in mixed salt potassium ions induced a homogeneous kappa-carrageenan network. Food-hydrocolloid work, not a skin study. Checked 6 September 2026.

2. [2]
   Quick Reference Table: ingredients found safe in the present practices of use and concentration

   Cosmetic Ingredient Review · 2024

   The Cosmetic Ingredient Review's table of every ingredient its Expert Panel has concluded on, updated 8 October 2024, contains no entry for potassium chloride: there is no CIR safety assessment of it as a cosmetic ingredient. Checked 6 September 2026.