Magnesium Stearate

Magnesium Stearate 1
AKA: 557-04-0, Magnesium distearate, Magnesium octadecanoate, Dibasic magnesium stearate, Octadecanoic acid, Magnesium salt, Synpro 90, Petrac MG 20NF, Stearic acid, Magnesium stearate g
Plant-Derived
Colorant
Plant Oil
Clean
The CIR Expert Panel concluded that the following ingredients are safe in the present practices of use and concentration described in the safety assessment when formulated to be non-irritating and non-sensitizing, which may be based on a QRA...Magnesium Stearate
Solubility IN 100 CC WATER: 0.003 G @ 15 °C; 0.004 G @ 25 °C; 0.008 G @ 50 °C
Formula
C36H70MgO4
Mol. Weight
591.20
CAS #
557-04-0
Form
Powder
Functions
Anticaking
Bulking
Colorant
Gives the product its color. Purely aesthetic — makes the formula look good in the jar but does nothing for your skin.
Moisturising
Locks In Moisture
Traditional Use
A synthetic compound developed in the 19th-20th centuries from stearic acid. Originally used in pharmaceuticals and later adopted by cosmetics as a thickening agent, lubricant, and anti-caking ingredient.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU✔ permitted
JAPAN✔ permitted
CANADA✔ permitted
Skin Types
●all-skin-types
Best For
Dryness
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