Preservatives for Shampoo and Liquid Soap

Yes, Phenoxyethanol can be used as a preservative in shampoo and liquid soap formulations. Products like Phenoxyethanol (Extra Pure) and Phenoxyethanol P5 are suitable for use in various cosmetic products, including water-based systems like liquid soaps and shampoos.

However, standard Phenoxyethanol is primarily effective against bacteria and less so against fungi. For broad-spectrum protection, especially in rinse-off products like shampoo and liquid soap which are exposed to water and potential contamination, you might consider using a broad-spectrum preservative blend.

Alternatives that offer broader protection and are suitable for these applications include:

• Phenoxyethanol SA (eq. Optiphen Plus): This blend is described as a very safe, broad-spectrum preservative effective against bacteria and fungi. It is suitable for all types of cosmetic products.
• Chlorphenesin / Phenoxyethanol (Microcare PHC eq.): This is also described as a highly effective preservative suitable for all types of products requiring preservation.

When choosing a preservative, always consider the specific pH range and temperature requirements of your formulation, as well as performing challenge testing to ensure efficacy.