The iron present in sauerkraut is necessary for increasing energy levels. Iron encourages the production of hemoglobin. The hemoglobin is essential for transporting oxygen which is crucial for health. The sauerkraut also contains vitamin C which aids in the absorption of iron. Iron increases metabolism and is necessary for blood circulation and improving oxygenation of the cells. Without iron, anemia can result. The side effects associated with anemia are headaches, cognitive impairment, and fatigue.

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