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3. The Human Body & Digestion / The Gut Microbiome / Problem 18
Problem 18
A patient consumes 100 µg of a B vitamin in the diet and small intestinal absorption captures 92% of it before the ileocecal valve. Microbial synthesis in the colon provides an additional estimated 5 µg available locally, of which 20% is absorbable systemically. Calculate the total systemic intake of this B vitamin (dietary absorbed + absorbed from microbially produced fraction). Show calculations.