Ferritin is a protein complex that serves as the primary storage form of iron in the body. It can store up to 4,500 iron atoms in a soluble and non-toxic form, helping to regulate iron levels and maintain homeostasis. Ferritin is found in various tissues, particularly in the liver, spleen, and bone marrow, and its levels in the blood can be an important indicator of iron status and overall health. Elevated or decreased ferritin levels can signal conditions such as iron deficiency or overload.