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How They Work Oral supplements rely on your digestive system for absorption
This protein is needed for B12 to be absorbed in the stomach
You should fully insert the needle into the muscle before pushing the plunger
The exact cause matters because some absorption problems are persistent, while others may be treatable or need specialist review
Contact your GP if you notice no improvement after 46 weeks of treatment, experience worsening neurological symptoms, or develop new unexpected symptoms
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