What is a common ingredient delivery system in skincare products that involves tiny encapsulated particles?

Microencapsulation and microsponge are both delivery systems used in skincare products, making the answer "C" a comprehensive choice.

Microencapsulation refers to the process of enclosing active ingredients within a tiny capsule, allowing for controlled release and enhanced stability. This method is effective for improving the bioavailability of sensitive or potent compounds, enabling them to be delivered more effectively to the skin over time. By using microencapsulation, the ingredients can maintain their efficacy and provide prolonged benefits without immediate degradation.

Microsponge also serves a similar purpose, using a sponge-like structure to entrap substances. This system allows for the slow release of the encapsulated ingredients, ensuring a sustained effect and minimizing the risk of irritation or adverse reactions associated with direct application of potent materials.

Both methods enhance the efficacy of skincare products by providing stability, controlled release, and improved skin penetration of active ingredients, highlighting why both options are correct in this context.