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Some studies indicate people with obesity have low vitamin B12 levels
While the effects of a vitamin B12 injected will become noticeable around 24 hours after administration, they will start to take effect almost immediately and will stay in your system for around 1 week, but may vary depending on the metabolic rate of the patient
So a 3ml bottle for a 250mcg dosage would give you 12 injections
in the 100 mg dose present here, serious GI effects are uncommon, but mild nausea or stomach discomfort could occur in sensitive patients
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