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Generally, its difficult to say precisely how long a vitamin B12 shot lasts in the body
The length of time B12 takes to work depends on your age and gut health, and how your body processes the vitamin
But for most individuals, its puzzling to understand precisely how long it takes before they notice a difference once they begin B12 supplements or injections
When to see a doctor Please seek medical advice promptly if you have any of the following after a B12 injection: Chest pain, a fast or irregular heartbeat, or breathlessness
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