It's undoubtedly true that severe deficiencies in certain vitamins can negatively affect your well-being. For instance, many people who get a regular vitamin B12 shot report an immediate, if temporary, burst of energy.

Some men seeking a "shot in the arm" for their sexual prowess may wonder whether a shot of B12 could help boost their erections.

What is vitamin B12?

B12 plays a crucial role in the development and function of the central nervous system, forming red blood cells and creating DNA. You can find vitamin B12 in foods such as beef, clams, bluefin tuna, milk, yogurt and fortified breakfast cereals. It's also available as a dietary supplement and a prescription medication.

The recommended daily amount of B12 for an adult who is not pregnant or breastfeeding is 2.4 micrograms (mcg). Most people adequately acquire this from their diet without supplementation.

However, some people have difficulty absorbing vitamin B12 from food because of pernicious anemia, gastrointestinal surgery, prolonged use of certain medications, specific congenital conditions or a vegan diet.

Symptoms of B12