Vitamin C and Iron

Definition

Vitamin C enhances non-heme iron absorption by reducing ferric iron to ferrous form and creating a chelate complex that prevents inhibitor binding. This synergy is crucial for plant-based iron sources.

How it works

Vitamin C (ascorbic acid) is one of the most powerful enhancers of non-heme iron absorption, increasing uptake by up to 4-fold when consumed in the same meal. The mechanism involves converting iron to a form more readily absorbed by intestinal cells and protecting it from inhibitors like phytates and polyphenols. This relationship is particularly important for vegetarians, vegans, and individuals with iron deficiency, as combining plant-based iron sources with vitamin C-rich foods can substantially improve their iron status without supplementation. Even small amounts of vitamin C (25-75 mg) can have significant effects.

Role

Dietary synergist that enhances non-heme iron bioavailability through chemical reduction and chelation.

Examples

• Lentils with tomato sauce
• Beans with orange juice
• Spinach with citrus
• Fortified cereals with berries
• Dark leafy greens with kiwi

Recommendations

Include vitamin C-rich foods in every meal containing plant-based iron sources: citrus fruits, berries, bell peppers, tomatoes, and kiwis are excellent choices. Consume these foods fresh when possible, as heat can reduce vitamin C content, though the iron-enhancing effect persists.

Key takeaway

Pairing plant-based iron sources with vitamin C is one of the most effective dietary strategies to prevent and manage iron deficiency.

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