Which among the following is correct regarding iron supplementation?

Appeared in: OSSSC Nursing Officer-2023

Explanation

Iron absorption is significantly increased in an acidic environment, which is facilitated by Vitamin C.
Lemon juice is a rich source of Vitamin C (ascorbic acid).
Vitamin C aids in the conversion of ferric iron (Fe³⁺) to the more readily absorbable ferrous iron (Fe²⁺) in the gut.
Therefore, taking iron supplements with lemon juice is the most effective method among the given options to maximize its therapeutic effect.

Option A: The calcium present in milk and other dairy products binds with iron, forming an insoluble complex that significantly inhibits its absorption in the gastrointestinal tract.
Option C: Taking iron with water is a neutral action. It does not inhibit absorption, but it also does not provide any enhancement. Compared to taking it with a source of Vitamin C, it is a less effective method for maximizing iron uptake.
Option D: Taking iron with food can decrease its absorption by as much as 40-50%. Components in food like phytates (in grains) and tannins (in tea/coffee) can bind to iron and prevent its absorption.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Factors affecting iron absorption as background academic context rather than a clinical decision trigger.
Nurses must educate patients on the correct administration of iron supplements to ensure therapeutic effectiveness and manage common side effects like constipation and GI upset.
Patient teaching should always include dietary sources of iron and Vitamin C, as well as substances to avoid (like dairy, tea, coffee, and antacids) when taking the supplement.
A common, harmless side effect of oral iron is that it turns stools a dark green or black color. Informing the patient about this can prevent unnecessary anxiety.

How to Approach the Question

First, identify the core of the question, which is about optimizing the absorption of oral iron supplements.
Recall the key physiological factors that influence drug and mineral absorption in the GI tract, particularly the role of stomach pH and interactions with other substances.
Evaluate each option based on known enhancers and inhibitors of iron absorption.
Option A (Milk): Recall that calcium in dairy inhibits iron absorption.
Option B (Lemon Juice): Recall that Vitamin C (ascorbic acid) from citrus fruits enhances iron absorption.
Option C (Water): Recognize this as a neutral vehicle that doesn't help or hinder significantly.

Concept Tested & Keywords

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E6 Pharmacology Nursing Lilley 11e Part 3 p. 221-223

E6 Nursing Brunner Adult Health 3SA Vol 1 Part 3 p. 136-138

Practise the full OSSSC Nursing Officer-2023

Attempt every question from this paper in a timed mock, then review the full solution for each one.