Vitamin B12 helps to produce red blood cells, myelin, DNA, and other neurological tissues. For this reason, it plays a key role in the normal functioning of the brain and nervous system. B12 also helps to regenerate folate in the body. Food sources: Sardines 189  cals 337.9%  Salmon 158  cals 236.2% Tuna 147  cals 110.8% Cod 96 cals 109.1%Continue reading “Vitamin B12 in fish and what to do before your medical test”