Selenium

Studies show that selenium, another powerful antioxidant, might be the best defense against cancer. By forcing cancer cells to self-destruct, it could be a man's best bet in the prevention of this deadly disease. It has also been used to improve a confused and depressed mental state, anxiety and mental fatigue.
Selenium is a trace element found naturally in foods like Brazil nuts, liver and animal proteins but can also be added to your diet by taking a 200-mcg dose daily.

Folic Acid
By lowering the levels of homocysteine, an amino acid that increases your risks of blood clots, folic acid helps prevent clogged arteries and improves blood flow to the brain. High homocysteine levels are also associated with early warning signs of Alzheimer's, such as dementia and memory loss. The recommended daily dose of 500 mcg can lower homocysteine levels by 18 percent or more. Food sources include citrus fruit, beans, and fortified breads and cereals.