Vitamin B12 is a vital part of one's health. Some people can not absorb it properly through their diet and their intesintes, so a viatmin B12 injection is neceassry to keep the amount in the body at the appropriate level.
There are also fad weight loss programs that use vitamin B12 shots.
Check with your doctor regardng your nutritional needs and this injection.
I take a vitamin B complex supplement everyday. It definitely helps raise my energy level. When I forget to take it I'm generally dragging by lunchtime (mostly due to a medication I take that causes drowsiness). The injections would have to work just as well as regular supplements. Even better if you can't absorb the vitamins normally. I don't think they've helped much with my weightless per se, but they've upped my energy enough that I am more able to do things like exercise during the day.
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