http://www.ncbi.nlm.nih.gov/pubmed/24152889

Ferrous bisglycinate 25 mg iron is as effective as ferrous sulfate 50 mg iron in the prophylaxis of iron deficiency and anemia during pregnancy in a randomized trial

http://europepmc.org/abstract/MED/11688078

Toxicology and safety of Ferrochel and other iron amino acid chelates.

http://link.springer.com/article/10.1007/s00404-007-0388-3

Iron supplementation in pregnancy—does the preparation matter?

http://europepmc.org/abstract/MED/11688081

Relative effectiveness of iron bis-glycinate chelate (Ferrochel) and ferrous sulfate in the control of iron deficiency in pregnant women.

http://www.sciencedirect.com/science/article/pii/S0753332212000662

Treatment of mild non-chemotherapy-induced iron deficiency anemia in cancer patients: Comparison between oral ferrous bisglycinate and ferrous sulfate.