Is Aluminum Zirconium Tetrachlorohydrex PG natural? NOI 0.88

Q: Is Aluminum Zirconium Tetrachlorohydrex PG natural?

Aluminum Zirconium Tetrachlorohydrex PG has a Natural Origin Index (NOI) of 0.88 (scale 0–1) per ISO 16128. The aluminium-zirconium chlorohydroxide core is a natural mineral salt; the propylene glycol complexing agent is petrochemical. An NOI of 0.88 means 88% of its molecular mass is traceable to a natural, renewable source.

How we scored it

Al4Zr(OH)12Cl4 mineral core (natural, ~545 Da) complexed with propylene glycol (petrochemical, ~76 Da) at an assumed ~1:1 ratio (not stated) → 545/621 ≈ 0.88.

What counts. ISO 16128-2 scores the atoms that remain in the final ingredient. Reagents, solvents, catalysts and protecting groups used during manufacture leave no mass behind and are not counted.

Where it comes from

The mineral aluminium-zirconium chlorohydrate core is produced from bauxite/zirconium ore, then complexed with petrochemical propylene glycol for solubility and stability. Exact PG:metal ratio varies by supplier, so this is an estimate.

In plain English

The active ingredient in many antiperspirants: a mineral aluminium-zirconium complex combined with propylene glycol to keep it stable in formulas.

CosIng definition: Aluminium zirconium chloride hydroxide, Al4ZrCl4(OH)12, reaction products with propylene glycol

Natural alternatives with the same function

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References

1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
2ALUMINUM ZIRCONIUM TETRACHLOROHYDREX PG. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
3ALUMINUM ZIRCONIUM TETRACHLOROHYDREX PG. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=ALUMINUM%20ZIRCONIUM%20TETRACHLOROHYDREX%20PG