What it is
Calcium Stearate is a metallic stearate, a fine powder formed from stearic acid and calcium. In formulations it can help stabilize emulsions, control flow and caking in powders, and adjust texture and opacity. In sunscreens and other products it is used at modest levels to support consistency and a smooth, uniform feel.
Safety & warnings
Metallic stearates such as calcium stearate are long-established cosmetic ingredients and are generally well tolerated with a low risk of irritation or sensitization. As a fine powder, inhalation of loose dust is a manufacturing handling consideration rather than a concern in finished, applied products. It is not regarded as a notable comedogen at typical use levels.
Origin & sourcing
Synthetic or naturally derived; made by combining a calcium source with stearic acid, which can come from plant or animal fats.
Questions everyone asks
What does calcium stearate do in a product?
It stabilizes emulsions, prevents caking in powders, and helps adjust texture, opacity, and viscosity.
Is calcium stearate related to stearic acid?
Yes. It is the calcium salt of stearic acid, formed by combining a calcium source with that fatty acid.