Oxygen is in brain due to iron poisoning. Iron attracts oxygen, causing free radicals.
Blood cells are damaged due to iron poisoning & bio-available copper deficiency. Iron is loosely bound in blood cells & breaks off easily, causing vascular damage; in this case in the vascular system of the brain. Iron is TIGHTLY bound to toxic proteins: bacteria, cancer, Alzheimer's, tumors, etc.
The antioxidants mentioned are just more toxins. They only help deplete more copper and facilitate the uptake of iron.