What are biologically inert ingredients?

Biologically inert ingredients refer to substances that do not engage in any chemical reactions within the skin during normal conditions. This means they are essentially stable and do not alter the biochemical processes of the skin. These ingredients are often used in formulations because they can serve a role without interfering with the skin's natural function or causing any adverse reactions.

This characteristic is particularly beneficial in cosmetic and skincare products, as it allows for a base or carrier that can help other active ingredients perform without introducing potential irritants or allergens. By being inert, these ingredients can also help maintain the integrity of the overall formulation, ensuring stability and safety for the user.

In contrast, the other options suggest qualities that do not align with the definition of biologically inert ingredients. Enhancing skin absorption or being highly reactive contradicts the inert nature, as those characteristics imply some level of interaction or response from the skin, which biologically inert ingredients lack. Similarly, while naturally derived substances could be inert, not all such substances are unprocessed or devoid of biological activity. Thus, the definition of biologically inert ingredients focuses specifically on their lack of reactivity within biological systems.