Sodium Sesquicarbonate
AKA “Magadi soda, Snowflake crystals, 533-96-0, Urao, Trisodium hydrogendicarbonate, Sodium carbonate (3:2), Carbonic acid, sodium salt (2:3), SQ 810, SESQUI TM
Ingredient
Ingredient Facts
Sodium sesquicarbonate
AKA: Magadi soda, Snowflake crystals, 533-96-0, Urao, Trisodium hydrogendicarbonate, Sodium carbonate (3:2), Carbonic acid, Sodium salt (2:3), SQ 810, SESQUI TM
Ingredient · Cleansing · EWG: 1
Synthetic
Cleanser
Clean
abundant salt in East African countries used in treatment of high- & low-tannin grain sorghums to reduce assayable tannins & improve nutritive value of grains; sodium sesquicarbonate salt (MF= Na2CO3NaHCO3.H2O); RN given refers to Na salt[2:3]
Solubility Freely soluble in water
Formula
C2HNa3O6
Mol. Weight
189.99
CAS #
533-96-0
Form
Powder
State
Dry Powder
See origin →
Functions
Buffering
Bulking
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Stabilizes pH
Adds Body & Volume
Removes Impurities
Removes dirt and impurities
Maintains optimal pH
Adds volume
Traditional Use
A naturally occurring mineral salt also produced synthetically. Used historically as a mild abrasive and cleansing agent, and in modern cosmetics as a pH buffer.
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
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Final Report on the Safety Assessment of Sodium Sesquicarbonate, Sodium Bicarbonate, and Sodium Carbonate
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Re-review Summary of Sodium Sesquicarbonate, Sodium Carbonate and Sodium Bicarbonate as Used in Cosmetics
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Sodium Sesquicarbonate
European Commission
EU Cosmetic Ingredient Database (CosIng)
Sodium Sesquicarbonate
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Re-Review Summary of Sodium Sesquicarbonate, Sodium Carbonate, and Sodium Bicarbonate as Used in Cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Cohen DE, Klaassen CD et al.
International journal of toxicology, 2025
Re-Review Summary of Sodium Sesquicarbonate, Sodium Carbonate, and Sodium Bicarbonate as Used in Cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Cohen DE, Klaassen CD et al.
International journal of toxicology, 2025
O-Alkyldithiocarbonic acids, salts of
Health Canada
Health Canada Cosmetic Ingredient Hotlist
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR