How to formulate cosmetics with a preservation boost?

Last update on Jun 9, 2025

Cosmetics, especially those containing water (>5%), provide a perfect breeding ground for microorganisms like bacteria, mold, and yeast. These microbes can multiply quickly, causing the product to: 

  • Spoil: Change color, texture, or develop a bad odor 

  • Contaminate: Harmful bacteria can grow, leading to skin infections or allergic reactions 

Preservatives help cosmetics stay fresh and effective throughout their shelf life. 

Bacterial growth in cosmetics (Source: Codex Labs Corp1)

Formulation strategies

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References
  1. (2023). Why natural preservatives for cosmetics is better. Codex Labs Corp.
  2. Resources to find latest information on banned preservatives in your specific location: U.S. Food and Drug Administration; Personal Care Products Council
  3. Campaign for Safe Cosmetics (CSC)