The absorption of iron from ferrous sulfate is indeed more efficient than from other forms, with the gastrointestinal tract converting dietary ferric iron to the more soluble and absorbable ferrous form.
Absorption of iron taken as ferrous sulfate is indeed more efficient than from other iron forms. Most dietary iron is in the ferric form (Fe³+), and the acidic environment of the gastrointestinal tract converts it to the ferrous form (Fe²+), which is more soluble and readily absorbed.
The duodenum and proximal jejunum are the primary sites for iron absorption. Enhancements in iron absorption are noted with the presence of certain proteins and acidic pH levels, facilitating the conversion of ferric iron to ferrous iron. Factors like the body's iron needs, especially in states like anemia, can also increase absorption efficiency. Conversely, reduced stomach size or extensive intestinal surgery can impair iron absorption.
So, it's true that iron in the form of ferrous sulfate has better absorption rates, given its solubility and the body's efficient mechanism to handle this form of iron, especially when iron is needed, such as in cases of anemia.