As described by the free-radical theory, exposure to oxidizing agents results in unstable oxygen compounds that can be neutralized by antioxidants. what antioxidant does the body produce?

The body produce NADPH a reducing equivalents as antioxidants.

Explanation:

During the pentose phosphate pathway reducing equivalents like NADPH is produced which help to prevent oxidative stress. It reduces glutathione via glutathione reductase which converts reactive H2O2 to H2O by glutathione peroxidase.

the answer to this question is 3.