This double-strength iron product is well suited to restore and maintain healthy blood iron levels. Iron is an essential component of hemoglobin, a molecule that transports oxygen to the body's cells, and myoglobin, which binds the oxygen used in muscle tissue. Protocol For Life uses Ferrochelᴹᴰ iron bisglycinate, which has superior absorption based on clinical studies and is well tolerated, as it is gentle and does not cause constipation.