I think I’d have to agree there, I’m not aware of antioxidants having an effect on sinuses. Unless, Selenium, (An antioxidant) can be of some use in your case? Selenium, as well as being an antioxidant, is vital in maintaining a health immune system and maintains the functions of the Thyroid Gland. If an irregular thyroid gland can contribute to sinus problems then yes, maybe it may well help. But don’t quote me on that, I ain’t a doctor.
Just to clear it up, there area various antioxidants such as Vitamin A, C, E, Beta-Carotene & Selenium. And probably a few more I’ve never heard off. If you have a sufficient dosage, probably 2-3 times the recommended daily allowance, they float around your body reducing the harmful effect that free radicals have on all your cells. Free radicals are created by all manner of chemical reactions in the body, primarily they are created in large quantities during respiration. Basically they’re just unpaired atoms that are left over after certain chemical reactions, in this state they are incredibly reactive as they desperately try to balance them selves by bonding with the first suitable atom they hit. These highly reactive free radicals are categorised as a form of Oxidising Agent. Anti Oxidants such as Vitamin A, C, E, Selenium etc. work by floating around your body’s system and allowing themselves to be oxidised by the free radicals. The theory is, if there is enough anti-oxidants in your system they’ll soak up the majority of the free radicals created rather than letting your various tissue cells take the brunt. Over time free radicals can really damage human body cells and help contribute to the ageing process. They are also linked to the cause of certain cancers.