Mixing Cosmetic Oils

Yes, you can mix several cosmetic oils together, such as Squalane, Rose Hip Oil, and Argan Oil. Mixing different oils does not reduce their effectiveness. In fact, combining them can enhance the overall benefits as each oil offers a unique profile of fatty acids, vitamins, and antioxidants that can complement each other, potentially leading to improved nourishment and skin health.

Regarding the absorption of high concentrations of oil (85-95%) into the skin, which contains both oil and water layers, pure oils can sometimes feel heavy or take longer to absorb effectively into the deeper, water-containing layers. To help oils penetrate the skin better, especially in high concentrations, you can incorporate a penetration enhancer.

Ethoxydiglycol is one such ingredient that can act as a solvent and carrier to help other substances, including oils, absorb into the skin more effectively.

There was a question about the recommended usage rate for Ethoxydiglycol, specifically regarding the percentages 5%, 20%, and 80%. Here's a clarification:

• The general recommended usage rate for Ethoxydiglycol in cosmetics is typically lower, often in the range of 1-10% (though specific regulations should always be checked).
• Using Ethoxydiglycol at concentrations above 5% in some formulas might cause a warming sensation on the skin. This is a potential sensory effect, not necessarily a sign of irritation or a hard usage limit.
• The percentage up to 80% refers to the maximum regulatory limit allowed by authorities like the FDA or manufacturers. While technically permitted up to this level, using such a high concentration is generally not practical or beneficial in cosmetic formulations as it would leave very little room for active ingredients.

Therefore, while Ethoxydiglycol can be used up to a high regulatory limit, practical cosmetic use is much lower, and concentrations above 5% might cause a warming feeling, depending on the specific formula.