why have a b12 injection Shots for Weight Loss: What You Need to Know Vitamin B12 Injection Side Effects
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Vitamin B6is mandatory for the human body in order to function properly, as it aids in the processing of sugar, fats, and proteins, which is highly important for people who want to add lean muscle mass

Causes of vitamin B 12 deficiency can be divided into three classes: nutritional deficiency, malabsorption syndromes, and other gastrointestinal causes (Table 2)

doi:10.1161/circep.112.971515 Zheng X, Jia R, Li Y, Liu T, Wang Z

Moreover, prophylactic B12 supplementation should be used from prepregnancy until the end of the lactation period in women with previously diagnosed B12 deficiency or who are at risk of vitamin B12 deficiency due for instance to low dietary intake of B12

Polski Merkuriusz Lekarski: Organ Polskiego Towarzystwa Lekarskiego

The complication rate is very low but not unheard of, nationwide the leak rate is around 2 % and the mortality rate is approximately 1%
