• VitaminB12 can provide many benefits.Image by Flickr.com, courtesy of D'Arcy Norman
  
  

Injections

• Vitamin B12 injections begin to work immediately, as it goes directly into the bloodstream. Those deficient in the vitamin will notice an overall sense of more energy.
  
  

Supplements

• Vitamin B12 in a supplemental form is a good idea to take, though taking it in pill form tends to not be absorbed by the body. Taking B12 Sublingual is a better way to ingest it since it melts in the mouth and goes into the bloodstream faster.
  
  

Significance

• Currently there is no evidence to support that B12 shots are more effective than the Sublingual method. The main problem with B12 is that it is hard for the body to absorb; in pill form it can be destroyed by the digestive system.
  
  

Considerations

• Many people like B12 shots because of the instant energy they feel afterward that lasts several days. B12 shots can be rather costly, at about $25 per injection as of October 2009.
  
  

Final Thoughts

• Elderly people and those with weakened immune systems normally benefit from B12 shots rather than the supplements.