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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