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Retired NBME 15 Answers

nbme15/Block 3/Question#8 (reveal difficulty score)
A 14-year-old boy has fatigue, intermittent ...
Vitamin B12 (cobalmin) ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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submitted by โˆ—baja_blast(219)
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Vitamin B12 (Cobalamin) is absorbed in the terminal ileum along with bile salts. Remember that this inquires Intrinsic Factor from the stomach! Other answer choices are primarily absorbed in other components of the GI tract.

Folic acid = Duodenum, Jejunum ("small bowel" in FA)

Iron = Duodenum

Thiamine = Jejunum

Riboflavin = "upper small intestine" when dietary or large intestine for the riboflavin produced by gut microbiome. See this paper

See FA 2019 p. 368 for the high-yield absorption sites.

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