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Vitamin B12 is an essential vitamin, but its not one your body can produce

Vitamin B12 helps with the following health functions: Improves brain function and neurological health Helps the formation of red blood cells and improves oxygen transportation throughout the body Helps the formation of DNA and RNA Prevents some types of anemia One key sign of a vitamin B12 deficiency is if youre excessively tired or weak

It carries an arginine substitution at position 3 and a 13-amino-acid N-terminal extension, giving it 83 amino acids total versus 70 for native IGF-1

You might have to take a B12 supplement or try a new medication