What Are the Dangers of Magnesium Stearate?

Magnesium stearate is a white powder that is derived from plants. Low amounts of magnesium stearate do not pose significant dangers, but excessive and dry magnesium stearate powder is particularly hazardous.

Explosion Hazard

Powder or the granular form of magnesium stearate is a dust explosion hazard, especially around a spark or open flame. Fine dust is distributed in the air in high concentrations.

Combustion

Magnesium stearate is highly flammable in the presence of oxygen. The chemical compound decomposes upon burning, emitting toxic and irritating fumes.

Chronic Exposure

Extreme and chronic inhalation of magnesium stearate can lead to pneumonitis, pulmonary edema, and cyanosis, which produces a bluish discoloration of the skin and mucous membranes.

Inhalation risk

Health problems from excessive inhalation of magnesium stearate include suppression of the immune system, improper cell function, difficulty in breathing and coughing.

Physical Dangers

Magnesium stearate exposure can irritate eyes.

References

• International Labour Organization
• Mallinckrodt Baker
• "Elements of danger: protect yourself against the hazards of modern dentistry"; Morton Walker, 2000