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Many people report feeling an energy boost within 12-48 hours
In order for B12 to be absorbed from the gut, it requires a specific protein called intrinsic factor (IF)
We do not give injections on demand without a clear clinical reason, and we will tell you honestly when a GP visit should come first
The beyond use date for an opened or entered (e.g., needle punctured) multiple-dose container with antimicrobial preservatives is 28 days, unless otherwise specified by the manufacturer
Most people feel a pinch when the needle goes in
You may refrigerate an opened vial at 2 to 8C if you prefer, but it does not extend the 28-day window
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