Cooling Agents WS-3 and WS-23 in Soap

Regarding the use of cooling agents WS-3 and WS-23 in soap formulations:

• WS-3 (Lip Cool™): According to the product description, WS-3 is only suitable for use in lip products and cannot cool the skin. Therefore, it is not recommended for use in soap, which is applied to the skin.

• WS-23 (Methyl Diisopropyl Propionamide): This cooling agent is designed to provide a cooling sensation on the skin and is suitable for use in products that come into contact with the skin. It can be used in soap formulations.

Differences between WS-3 and WS-23

The main difference lies in their intended application and effect:

• WS-3: Primarily for lip products, provides a clean, taste-free cooling sensation lasting about 20 minutes. It is derived from menthol but modified to remove taste/smell.
• WS-23: Provides a cooling sensation directly on the skin and is suitable for a wider range of skin contact products.

Usage Rate

• For WS-23 in skin products like soap, the recommended usage rate is 0.1-0.5% depending on the desired cooling intensity.
• For WS-3 (if used in appropriate lip products), the usage rate is 0.05-0.5%.

In summary, for adding a cooling effect to soap, WS-23 is the appropriate choice, while WS-3 is not suitable.