Sodium Phosphate
molecular structure · PubChem
AKA: Monosodium phosphate, SODIUM DIHYDROGEN PHOSPHATE, Sodium acid phosphate, Monobasic, Sodium primary phosphate
Synthetic
Clean
Sodium dihydrogenorthophosphate
Effective at 0.28%
Formula
NaO4P-2
Mol. Weight
117.96
CAS #
7558-80-7, 7632-05-5
Form
Powder
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.
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%
Reported use
CIR reported use: 0.033-0.4 | 0.006-0.56
Regulatory Agencies
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR