where do they give vitamin b12 injections to Safely Inject B12: A Comprehensive Guide How to Give a B12
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Those observations are included here only to summarize research context
Vegans and vegetarians need to replace the nutrients by other means, B12 injections are an efficient and effective way to replace the nutrients lost from abstaining from meat, eggs, and dairy

There is very little evidence that vitamin B-12 affects peoples weight, be it loss or gain

Treating pernicious anaemia with Neo-B12 Injection Neo-B12 Injection contains hydroxocobalamin commonly known as vitamin B12 that used to treat pernicious anaemia and other forms of macrocytic anaemias
