Simple:
* Berries are packed with antioxidants.
* Green tea contains antioxidants that may help protect cells from damage.
Descriptive:
* The antioxidant properties of vitamin C help combat free radicals in the body.
* Researchers are studying the role of antioxidants in preventing certain types of cancer.
Specific:
* Eating a diet rich in fruits and vegetables provides a good source of antioxidants.
* This skin cream contains antioxidants to help reduce wrinkles.
Figurative:
* My grandmother's wisdom is like a powerful antioxidant, protecting me from life's troubles.
The best way to use "antioxidant" in a sentence depends on the context and what you want to convey.