Penetration Enhancers for Oil-Soluble and Water-Soluble Ingredients

Regarding your question about penetration enhancers capable of carrying both oil-soluble and water-soluble ingredients into the skin:

Yes, Ethoxydiglycol is suitable for this purpose. Based on its description, it acts as a safe and effective solvent and carrier in cosmetics, capable of dissolving in water, glycols, and natural oils. This property allows it to help deliver both water-soluble and oil-soluble substances into the skin.

In addition to Ethoxydiglycol, other ingredients that can function as carriers for both types of substances include:

• Phospholipids: These are known for their ability to carry both water-soluble and oil-soluble ingredients and can also provide a good skin feel and moisture.
• Dimethyl Isosorbide (DMI): This is another carrier with a long history of use, known for its safety and efficiency in helping active ingredients penetrate the skin.

When formulating, it's important to consider the recommended usage rates for each ingredient, as these can vary depending on the specific product type (leave-on, rinse-off, etc.) and local regulations.