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Calcium Stearate: Uses, Safety and Effects

Calcium stearate is a calcium salt of stearic acid used as a food additive, lubricant, and stabilizer in the food, pharmaceutical, and industrial sectors.

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Things worth knowing about "Calcium Stearate"

Calcium stearate is a calcium salt of stearic acid used as a food additive, lubricant, and stabilizer in the food, pharmaceutical, and industrial sectors.

What is Calcium Stearate?

Calcium stearate is a calcium salt of stearic acid, a saturated fatty acid with 18 carbon atoms. It appears as a white, waxy powder that is insoluble in water but soluble in hot organic solvents. While it occurs naturally in some plant and animal fats, it is predominantly produced industrially through the reaction of calcium hydroxide with stearic acid.

Applications

Food Industry

In the European Union, calcium stearate is approved as a food additive under the designation E 470b. It functions as an emulsifier, anti-caking agent, and stabilizer. Common uses include:

Preventing powders, granules, and tablets from clumping together
Acting as a lubricant in the manufacturing of confectionery and baked goods
Stabilizing food surfaces, for example in chewing gum and coatings
Non-stick agent in food processing equipment

Pharmaceutical Industry

Calcium stearate is widely used in pharmaceuticals as a tablet lubricant and processing aid. It improves the flow of powder blends in tablet presses and prevents granules from sticking to machine components. Typical concentrations in tablet formulations range from 0.5 to 2 percent.

Other Industrial Uses

Beyond food and pharmaceuticals, calcium stearate is used in a variety of other industries:

Plastics industry as a heat stabilizer and lubricant for PVC and other polymers
Cosmetics industry as a thickener and emulsion stabilizer
Paper industry to improve printability and surface quality
Construction industry as a water-repellent coating agent

Safety and Tolerability

Calcium stearate is generally recognized as safe (GRAS) and has been approved for use in food and pharmaceutical applications by both the U.S. Food and Drug Administration (FDA) and the European Food Safety Authority (EFSA). The quantities used in food products and dietary supplements are minimal and considered safe for consumption.

Calcium stearate is not biologically toxic. Stearic acid, its primary component, is a naturally occurring fatty acid that the human body can readily metabolize. Allergic reactions to calcium stearate are very rare but may occur in individuals with a sensitivity to stearic acid or calcium compounds.

Interactions and Special Notes

When used as intended in food products and pharmaceuticals, no significant interactions with other nutrients or medications have been identified. In industrial settings, where higher concentrations may be encountered, contact with the eyes and respiratory tract should be avoided. Appropriate protective measures should be taken during prolonged occupational exposure.

References

European Food Safety Authority (EFSA): Scientific Opinion on the re-evaluation of fatty acids (E 570) as food additives. EFSA Journal, 2015.
U.S. Food and Drug Administration (FDA): GRAS Substances (SCOGS) Database – Calcium Stearate. FDA.gov, 2023.
Rowe, R. C., Sheskey, P. J., Quinn, M. E.: Handbook of Pharmaceutical Excipients, 7th Edition. Pharmaceutical Press, London, 2012.

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