Vitamin B12 shots are usually deep intramuscular injections every 2-3 months in large muscles
This can lead to improved muscle mass and overall body composition
Low B12 doesnt directly cause weight gain, but chronic fatigue and slow metabolism from a deficiency may lead to reduced activity levels, contributing to weight gain over time
This makes vitamin B12 deficiencies a particular concern for those following vegetarian or vegan diets
Because your body cannot make B12 on its own, you must get it from food, supplements, or medical injections
Neomycin, colchicine, para-aminosalicylic acid, or excessive alcohol intake longer than two weeks may cause malabsorption of vitamin B12. Chloramphenicol and other drugs having bone marrow suppressant properties may cause a lack of therapeutic response to vitamin B12