Magnesium Alginate
AKA “Alginic acid, magnesium salt”
Ingredient
Ingredient Facts
Magnesium alginate
AKA: Alginic acid, Magnesium salt
Ingredient · Emulsion Stabilising · EWG: 3
Plant-Derived Synthetic
Emulsifier
Marine
Not Clean
Alginic acid, magnesium salt
CAS #
37251-44-8
See origin →
Functions
Binding
Emulsion Stabilising
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Viscosity Controlling
Anti-Inflammatory
Fights Acne
Antioxidant
Holds ingredients together
Keeps product blended
Controls product thickness
Traditional Use
Created from alginic acid derived from brown seaweed to leverage magnesium's traditional mineral benefits; developed in the mid-20th century as a thickening and hydrating agent for modern skincare.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
3
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Concentration Guide
Dermal absorption: 2%. Source: CIR Safety Assessment (CIR Seq 680).
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR