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Description
A Vitamin B12 shot is a concentrated dose of cobalamin delivered directly into your muscle via an intramuscular injection

Symptoms: Fatigue Weight gain Depression Sensitivity to cold Dry skin and hair Constipation 2

Some users report mild side effects, such as transient discomfort at injection sites or gastrointestinal upset, though comprehensive adverse effect data are scarce

Because of this variability, there is no single detection window that applies to all peptides