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Published human trials mainly studied oral and intravenous forms, so subcutaneous amounts come from community practice rather than an approved clinical protocol
Vitamin B12 deficiency in over 16s: diagnosis and management (NG239) Recommendations
Some evidence suggests a link between low vitamin B12 levels to a higher risk of dementia, Alzheimers disease, and Parkinsons disease
concerns regarding unpredictable absorption The mechanism for the oral route is based on passive absorption of vitamin B 12 (without binding to intrinsic factor) as well as active absorption (following binding to intrinsic factor, if present, e.g
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