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Common side effects include mild pain, redness, or swelling at the injection site
(113(1)):5-15 doi:10.1093/qjmed/hcz046
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Individual differences: The duration of B12 injection benefits can also vary based on individual factors, such as age, genetics, and overall health status
One review concluded that vitamin B12 plays a key role in fat metabolism, noting that a deficiency could be linked to increased fat accumulation and obesity ( Another animal study found that severe vitamin B12 deficiency led to a significant increase in body fat percentage and cholesterol levels in pregnant mice ( Whats more, one animal study showed that administering B vitamins to rats fed a high fat diet reduced weight gain and increased levels of several enzymes that influence metabolism, compared with a control group ( However, current evidence is lacking, and additional high quality studies are needed to determine how vitamin B12 may affect metabolism and body fat in humans
B12 shots deliver a concentrated dose of cobalamin directly into muscle tissue, making them especially valuable for individuals with absorption disorders
