The best product to mix with foundation is moisturizer. This creates a more natural, less heavy application and provides added hydration. Serums, due to their high concentration, are generally not recommended for mixing into foundation for everyday use.
Why Moisturizer?
- Improved Blendability: Mixing moisturizer with foundation thins the consistency, making it easier to blend for a smoother, more natural-looking finish, especially with thicker foundations. This is particularly helpful if your foundation is too heavy or thick.
- Added Hydration: Moisturizer adds hydration to your skin, preventing a dry, cakey look and improving the overall look and feel of your makeup.
- Versatile Compatibility: Many moisturizers easily blend with various foundation formulas.
Several Reddit users (https://www.reddit.com/r/muacjdiscussion/comments/mgbmmf/what_are_your_favourite_things_to-mix-with/, https://www.reddit.com/r/PaleMUA/comments/12b6m46/does_anyone_else_mix_foundation_and_moisturizer/, https://www.reddit.com/r/IndianMakeupAddicts/comments/124e7ab/best_moisturiser_to_mix_your_foundation_with/) and Quora users (https://www.quora.com/I-just-bought-a-foundation-and-realized-it-is-too-thick-heavy-Can-I-mix-it-with-a-bit-of-moisturizer-just-right-before-applying-it-to-my-face, https://www.quora.com/Is-it-a-good-idea-to-mix-foundation-with-moisturizer) have confirmed this practice. Specific examples of moisturizers mentioned include Emolene, Neutrogena Hydro Boost, and Formula RX Peptide moisturizer. Also, a clear primer like NYX Studio Perfect can offer similar benefits.
Note: Always start with a small amount of moisturizer and add more as needed to achieve your desired consistency.
