Vitamin B12

• Studies on individuals with low vitamin B12 levels show that they had more shrinkage in their brains than those with adequate B12 levels. B12 also reduces homocysteine levels; elevated levels of homocysteine show up in dementia and depression.
  
  

Vitamins A, C and E

• These vitamins provide strong antioxidants to fight free radicals in the brain. The free radicals are one cause of early cell death, which might lead to premature senility.
  
  

Vitamin B6

• Vitamin B6 is important in the production of neurotransmitters.
  
  

Essential Fatty Acids

• Krill oil and flax seed oil are just two oils that contain omega essential fatty acids. These help improve the circulation of blood and prevent strokes and depression.
  
  

Folic Acid

• Folic acid improves cognitive functioning as long as you have adequate levels of B12, too.
  
  

Magnesium

• Magnesium helps build and repair nerves. A deficiency of this mineral shows up as muscle tremors, anxiety, confusion, depression and insomnia.