Anti-oxidants or factors acting on intracellular antioxidants are relevant to pretty much every disease known to us. Oxidative stress either causes a disease, leads to a worsening of a disease or can be used to cure a disease.
Hundreds of people will read those pages and they act as a great way of summarising the knowledge gained by years of meticulous research.
Also, these pages are unlikely to be the fruits of someone who has sat down and decided to bash out a wikipedia page in an evening. Someone who has carried out the research will likely have papers / reports already written, it's not that difficult to condense into a palatable form. Wikipedia is probably one of the best ways to disseminate new knowledge, which is then verified when publish in a journal.