As an expert in the field of nutrition and supplementation, I can provide you with a detailed comparison of the iron salts mentioned. When it comes to choosing the best iron salt, it's important to consider factors such as bioavailability, side effects, and the individual's specific needs. Ferrous sulfate is one of the most commonly used and well-studied forms of iron. It has a relatively high iron content (about 20-30% elemental iron) and is known for its good absorption rates. However, it can cause gastrointestinal side effects like constipation and nausea in some individuals. Ferrous fumarate has a lower iron content (about 33% elemental iron) compared to ferrous sulfate, but it is also well-absorbed and may cause fewer gastrointestinal side effects, making it a preferred choice for those sensitive to iron's side effects. Ferrous gluconate has the lowest iron content (about 2.5-12% elemental iron) and is often chosen for its gentler effect on the stomach, although it may require a higher dosage to achieve the same therapeutic effect. Controlled-release formulations, such as Slow FE, are designed to release the iron slowly over time, which can help reduce the risk of side effects. However, they may not be as readily absorbed as other forms. In conclusion, the best iron salt for an individual depends on their specific needs, tolerance to side effects, and the severity of their iron deficiency. It's always recommended to consult with a healthcare professional before starting any supplementation. read more >>

ReferencesIron supplement groupGeneric or brand nameDosageFerrous saltsFerrous sulfate (generic)Tablet: 325 mg po tidFerrous fumarate (generic)Tablet: 300 mg (99 mg iron) po bidFerrous gluconate (generic)Tablet: 325 mg (36 mg iron) po tidControlled-releaseSlow FE (Novartis)Tablet: 160 mg (50 mg iron) po tid4 more rowsread more >>