Feeling sluggish and run down? Have trouble remembering things? Your body is trying to tell you something… something is missing. Vitamin B12 deficiency can cause fatigue, weakness, low energy, and even neurological changes. Vitamin B12 is a water-soluble vitamin that keeps both nerves and red blood cells healthy. B12 contributes to the successful synthesis of DNA, which promotes the normal functioning of the nervous system and the production of hemoglobin. It’s no wonder that B12 is the go-to vitamin when it comes to boosting your metabolism and strengthening your immune system. While it’s hard to narrow down all the perks of B12 to just a handful, here are the top 5 benefits of vitamin B12.