All the following affects absorption of calcium EXCEPT_____________?
Correct answer: B. Retinoic acid
- A. citric acid
- B. Retinoic acid
- C. phytates
- D. Oxalates
Explanation
Phytates and oxalates bind calcium in the gut and reduce its absorption, whereas citric acid promotes absorption; retinoic acid is not a usual inhibitor. Therefore retinoic acid is the exception.
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