Vitamin B12 is a water-soluble vitamin, also known as cobalamin. It plays a vital role in brain function and the production of DNA, and red blood cells. 

B12 shots help maintain healthy energy levels, enhance brain function and promote a healthy weight. People at risk of vitamin B12 deficiency include the elderly (the ability to absorb vitamin B12 can decrease with age), those who have had intestinal surgery, vegans, vegetarians, and diseases that affect the gut. Deficiency can also be a result of poor absorption. Indeed, Vitamin B12 shots, as opposed to oral supplements, are especially beneficial for those suffering gastrointestinal issues as injections largely bypass first pass metabolism and are absorbed directly into the bloodstream.

Research links low vitamin B12 levels to various health conditions like dementia, depression, osteoporosis, and macular degeneration.