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Rajman L, et al
B12 shots are usually given into a muscle, like your upper arm or thigh
If you're getting a cyanocobalamin (also present in oral and sublingual B12) that's more likely to cause negative reactions
The presence of comorbidities can significantly impact the pharmacokinetics of Vitamin B12, making it essential to adjust dosing protocols. Expert Opinion on Vitamin B12 Therapy Genetic Factors Affecting B12 Metabolism Genetics play a role in how well someone can use Vitamin B12
The choice depends on muscle mass and the doctors preference
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