Sodium Phosphate
AKA “Monosodium phosphate, SODIUM DIHYDROGEN PHOSPHATE, Sodium acid phosphate, Sodium phosphate, monobasic, Sodium primary phosphate”
Ingredient
Ingredient Facts
Sodium phosphate
AKA: Monosodium phosphate, SODIUM DIHYDROGEN PHOSPHATE, Sodium acid phosphate, Monobasic, Sodium primary phosphate
Ingredient · Buffering · EWG: 1
Synthetic
Clean
Sodium dihydrogenorthophosphate
Effective at 0.28%
Formula
NaO4P-2
Mol. Weight
117.96
CAS #
7558-80-7, 7632-05-5
Form
Powder
See origin →
Functions
Buffering
Anti Seborrheic
Deodorant
Anti-Inflammatory
Boosts Collagen
Wound Healing
Controls flaking and oiliness
Neutralizes odor
Maintains optimal pH
Traditional Use
Discovered as a salt in the 18th century. Used historically in cleaning applications and later adopted in cosmetics as a pH buffer and chelating agent from the 20th century onward.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Concentration Guide
0.006%
0.56%
0%1%
Effective Range
CIR reported use: 0.033-0.4 | 0.006-0.56
Regulatory Agencies
Calcium Potassium Sodium Phosphate
European Commission
EU Cosmetic Ingredient Database (CosIng)
Disodium Phosphate
European Commission
EU Cosmetic Ingredient Database (CosIng)
Sodium Phosphate
European Commission
EU Cosmetic Ingredient Database (CosIng)
Trisodium Phosphate
European Commission
EU Cosmetic Ingredient Database (CosIng)
Disodium Phosphate
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Sodium Phosphate
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Trisodium Phosphate
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
In vivo and in vitro evaluation of combretastatin A-4 and its sodium phosphate prodrug.
Grosios K, Holwell SE, McGown AT, Pettit GR, Bibby MC
British journal of cancer, 1999
Trisodium Phosphate and Cetylpyridinium Chloride Spraying on Chicken Skin to Reduce Attached Salmonella typhimurium.
Wang WC, Li Y, Slavik MF, Xiong H
Journal of food protection, 1997
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR