pH Adjuster
METAPHOSPHORIC ACID
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A condensed inorganic phosphoric acid (HPO3 polymer) used to buffer pH and chelate metals — handy for stabilising vitamin C. Mild irritant; safe at typical neutralized cosmetic levels.
Function
Skin benefits
- Buffering agent for acidic formulations
- Mild chelator of metal ions
- Stabilizes vitamin C and other oxidation-sensitive actives
Known concerns
- Skin and eye irritant at higher concentrations
- Hygroscopic and acidic — pH-control needed
- Not approved as a finished-product preservative on its own
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related ph adjusters
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.