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AMMONIUM MONOFLUOROPHOSPHATE.

Questionable CAS 20859-38-5 / 66115-19-3 / ANTIPLAQUE, ORAL CARE

Ammonium Monofluorophosphate is primarily recognized for its role in oral hygiene, releasing fluoride ions to strengthen enamel and prevent cavities. While not a primary skincare active, it can function as a pH buffer.

buffering

Science

Its main action involves releasing fluoride ions through enzymatic hydrolysis, which is crucial for dental health. In cosmetic formulations, it primarily serves as a pH stabilizing or buffering agent on the skin.


Research

High confidence
Effective range ≤0.15%
Optimal

N/A

Key findings

  1. 01 FDA OTC Anticaries Monograph; EU Cosmetics Regulation Annex III (0.15% as F for caries prevention)
  2. 02 PMID: 1045330 (Caries Preventive Effects of Monofluorophosphate Toothpastes - 0.8% concentration)

Transparency

Not commonly dusted

As this ingredient is mainly utilized in oral care and not commonly formulated into leave-on skincare, the concern of 'dusting' is generally not applicable.


The Formula

Solubility
Water
Optimal pH 6.5 – 8
0 7 14

Stability

This compound is prone to hydrolysis in acidic conditions or prolonged water exposure, breaking down into fluoride and phosphate. It shows improved stability in glycerol-water mixtures.

Conflicts

  • Calcium salts (may precipitate as calcium fluoride)
  • Strong acids
  • Metal ions (can form complexes affecting appearance)

Safety

CIR Status
Not reviewed
Max tested
0.15%
Sensitization risk Low

The maximum concentration of 0.15% is calculated as total Fluorine (F) and is regulated for oral care. This ingredient is not typically used in leave-on skincare products.


Your Skin

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Questionable

While highly effective in oral care for fluoride delivery, its utility as a direct skincare active is limited to buffering, making its inclusion in skincare formulations questionable for other benefits.


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