Globally, demand for antioxidants is estimated to reach over 103,000 thousand tons by the end of 2020, but it isn't because people are buying miracle supplements and Fountains of Youth, it is because of food.
Oxidation of food items often leads to color change, rancidity and sometimes a drop in nutritional value and owing to the "natural" craze (some would call it a fallacy), demand for antioxidants has significantly increased, especially in the food and beverage industry owing to their incredible ability to preserve food for long durations.
They're using science to artificially preserve foods, yet it is natural. Groups that are opposed to food science, like Center for Science in the Public Interest, won't know what to make of it. It's probably only a matter of time before the wackier fringe of the anti-science community claims preservatives like rosemary extracts, carotenoids and ascorbic acid will also make you live longer and keep younger skin.
However, that has a cultural implications too. Believers in antioxidants may not want to buy packaged food items, particularly processed meat, which has the highest demand for food preservation and a need to keep out harmful bacteria. It will be difficult marketing to claim natural antioxidants over synthetic antioxidants when all of the supplements being sold to consumers are synthetic. Unless you eat 70 pounds of spinach per day you can't get enough antioxidants to do anything at all, much less anything positive.
The marketing groups behind this hope those gullible enough to take powdered green tea as a supplement will see past the inconsistency here.