Ammonium Phosphate
AKA “Ammonium dihydrogen phosphate, Ammonium biphosphate, MONOAMMONIUM PHOSPHATE, Ammonium dihydrogen orthophosphate, Phosphoric acid, monoammonium salt, Ammonium monophosphate, Ammonium dihydrophosphate
Synthetic
Ingredient Facts
Ammonium phosphate
AKA: Ammonium dihydrogen phosphate, Ammonium biphosphate, MONOAMMONIUM PHOSPHATE, Ammonium dihydrogen orthophosphate, Phosphoric acid, Monoammonium salt, Ammonium monophosphate, Ammonium dihydrophosphate
Synthetic · Antimicrobial · EWG: 4
Synthetic
Preservative
Synthetic
Clean
Helps maintain the pH balance of oral care products to keep your mouth fresh and comfortable.
Effective at 4.78%
Solubility Slightly soluble in ethanol; insoluble in acetone
Formula
H6NO4P
Mol. Weight
115.03
CAS #
7722-76-1
Form
Powder
State
Dry Powder, Pellets or Large Crystals; Pellets or Large Crystals; NKRA; Other Solid; Liquid; Dry Powder
See origin →
Functions
Buffering
Oral Care
pH Regulator
Antimicrobial
Keeps your product from growing bacteria, mold, or yeast. Without these, that jar of cream becomes a petri dish in about a week.
Stabilizes pH
Reduces Inflammation
Locks In Moisture
Supports dental health
Maintains optimal pH
Traditional Use
A synthetic salt developed for industrial uses. Incorporated into cosmetics in the 20th century as a buffering and pH-regulating agent with no significant traditional use history.
Skin Types
all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Concentration Guide
0.25%
9.3%
0%13%
Effective Range
CIR reported use: 0.25-9.3
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Safety Assessment of Phosphoric Acid and Its Salts as Used in Cosmetics
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Ammonium Phosphate
European Commission
EU Cosmetic Ingredient Database (CosIng)
Diammonium Phosphate
European Commission
EU Cosmetic Ingredient Database (CosIng)
Metaphosphoric Acid
European Commission
EU Cosmetic Ingredient Database (CosIng)
Phosphoric Acid
European Commission
EU Cosmetic Ingredient Database (CosIng)
Phosphoric Acid
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Safety assessment of diammonium phosphate and urea used in the manufacture of cigarettes.
Stavanja MS, Curtin GM, Ayres PH, Bombick ER, Borgerding MF et al.
Experimental and toxicologic pathology : official journal of the Gesellschaft fur Toxikologische Pathologie, 2008
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR