## Core Concept
The absorption of inorganic iron is influenced by various dietary factors. Inorganic iron, primarily in the form of non-heme iron, is absorbed mainly in the duodenum. Several substances can enhance or inhibit its absorption.

## Why the Correct Answer is Right
Vitamin C (ascorbic acid) is well-known for enhancing the absorption of non-heme iron by reducing ferric iron to ferrous iron, which is more soluble and easily absorbed. Organic acids and certain amino acids can also enhance iron absorption through similar mechanisms. However, **phytates**, which are found in whole grains, legumes, and some vegetables, bind minerals including iron, significantly reducing their absorption. This is particularly relevant in populations consuming a diet high in phytate-containing foods.

## Why Each Wrong Option is Incorrect
- **Option A:** Vitamin C is known to enhance iron absorption, making it incorrect as an answer to what does *not* enhance iron absorption.
- **Option B:** Organic acids can help in enhancing iron absorption, similar to vitamin C, by aiding in the reduction of ferric to ferrous iron.
- **Option D:** Certain amino acids can also facilitate better absorption of inorganic iron.

## Clinical Pearl / High-Yield Fact
A key clinical pearl is that for individuals, especially those at risk of iron deficiency (e.g., pregnant women, individuals with gastrointestinal disorders), advising them to consume foods high in vitamin C along with iron-rich foods can significantly enhance iron absorption. Conversely, advising them to limit phytate-containing foods or to use cooking methods that reduce phytate content (such as soaking and boiling) can also help.

## Correct Answer: C. Phytates