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That is why blood testing may be appropriate in people with risk factors even when symptoms are mild
In some cases, people might experience dizziness, headache, or an allergic reaction
They work best as part of a comprehensive program that includes proper diet and exercise
[1] Because intrinsic-factor-dependent uptake in the distal ileum can be absent in conditions such as autoimmune gastritis, pancreatic insufficiency, or bariatric surgery, the intramuscular or subcutaneous route bypasses gastrointestinal barriers and reliably restores serum concentrations
State which basis is being used in the record
2001 Dec;142(12):5182-9
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