Antibodies to intrinsic factor (IF) bind to IF and prevent formation of the IF-B 12 complex, further inhibiting vitamin B 12 absorption
Wang et al
HERRING 158kcal, $0.65, per 100g An Atlantic fish, among the top five most caught of all species
Feature Vitamin Injections Oral Supplements Bioavailability Up to 100% (direct muscle absorption) Variable, often 10-50% (digestive system absorption) Speed of Action Rapid (hours to days for noticeable effects) Slower (days to weeks for noticeable effects) Ideal Candidates Diagnosed deficiencies, malabsorption issues, pernicious anemia, older adults, vegans/vegetarians with deficiency General maintenance, mild deficiencies, individuals with healthy digestion and absorption Administration Intramuscular injection by professional Pills, capsules, liquids taken by mouth For general maintenance in healthy people, oral supplements work fine
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