Calcium Dihydrogen Phosphate
AKA “7758-23-8, CALCIUM PHOSPHATE MONOBASIC, Acid calcium phosphate, Monobasic calcium phosphate, Monocalcium orthophosphate, Calcium bis(dihydrogen phosphate), Primary calcium phosphate, Calcium monobasic phosphate, Calcium phosphate (1:2)
Ingredient
Ingredient Facts
Calcium dihydrogen phosphate
AKA: 7758-23-8, CALCIUM PHOSPHATE MONOBASIC, Acid calcium phosphate, Monobasic calcium phosphate, Monocalcium orthophosphate, Calcium bis(dihydrogen phosphate), Primary calcium phosphate, Calcium monobasic phosphate, Calcium phosphate (1:2)
Ingredient · Buffering · EWG: 4
Synthetic
Not Clean
Phosphoric acid, calcium salt (2:1)
Solubility Solubility: Cold water 1.8 g/100 cc @ 30 °C; decomposes in hot water. /Calcium phosphate monobasic monohydrate/
Formula
CaH4O8P2
Mol. Weight
234.05
CAS #
7758-23-8
Form
Powder
State
NKRA; Dry Powder, Pellets or Large Crystals; Pellets or Large Crystals; Dry Powder
See origin →
Functions
Buffering
Anti-Inflammatory
Boosts Collagen
Antimicrobial
Maintains optimal pH
Traditional Use
A synthetic mineral salt developed in the 20th century as a buffer and stabilizer. No traditional use; created specifically for modern cosmetic and pharmaceutical formulations.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR