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pH Adjuster

FERROUS AMMONIUM SULFATE

CAS 10045-89-3
60

Safety score · 0–100

Fine

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

A double salt of ferrous (Fe-II) and ammonium sulfate, sometimes called Mohr's salt, used in cosmetics as a minor astringent or pH/redox modulator. Generally fine at low levels but pro-oxidant.

Function

ANTIMICROBIAL

Skin benefits

  • Mild astringent / antimicrobial in trace amounts
  • Iron source for some specialty formulations
  • Inexpensive standardization aid

Known concerns

  • Ferrous iron can catalyze oxidation of sensitive ingredients
  • High concentrations can stain skin/textiles
  • Sulfate chemistry can irritate sensitive skin

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

Related ph adjusters

60
AMINO METHYLISOBUTANOL
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AMMONIUM CARBAMATE
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ISOBUTYRIC ACID
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PELARGONIC ACID
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SODIUM SILICATE EXTRACT
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METHYL LACTIC ACID
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MORPHOLINOPROPANE SULFONIC ACID
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 62
POTASSIUM CARBONATE
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.