The antioxidant network consists of every substance that actually participates in any way in detoxifying demonstrably harmful free radicals (some free radicals are messengers). It is not limited to vitamin C, vitamin E, CoQ10 and lipoic acid, as Packard claims. It is much larger than that (how in the world did he forget glutathione, glutathione reductase, NADPH?), and consists principally of enzymes, essential nutrients, and a large number of accessory nutrients. In animal model systems not fed a real food diet, the network is very much contracted since many accessory nutrients are missing or deficient in concentration.
What is true of the antioxidant network is true of every other network in our bodies and the body is a network of networks of networks, etc.