Application Duration for Cosmetic Formulations

The appropriate duration for leaving on general cosmetic formulations primarily depends on the type of product and the ingredients used. There is no single fixed duration for all formulas.

• Wash-off products: Such as cleansers, some masks, and scrubs. These products are typically designed for brief contact with the skin for cleansing or temporary action of active ingredients before being rinsed off with water. The duration can vary from a few seconds to 10-20 minutes, depending on the product's instructions.
• Leave-on products: Such as moisturizers, serums, and sunscreens. These products are designed to remain on the skin for extended periods, potentially all day or all night, to continuously nourish, protect, or address skin concerns.

Therefore, determining the appropriate duration should be based on the formula's purpose and the properties of each ingredient.