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The recommended duration for treatment of iron deficiency with ferrous supplements is generally around three months after achieving normal hemoglobin levels. This duration allows for the replenishment of iron stores in the body, which is essential for restoring red blood cell production and correcting any deficiency.

Iron deficiency anemia often requires not only the correction of hemoglobin levels but also the re-establishment of adequate iron stores to prevent recurrence of the deficiency. The body needs time to absorb the iron and utilize it effectively for forming hemoglobin, and three months is an appropriate timeframe to ensure that both the immediate and long-term needs are met.

Therefore, using ferrous supplements for a duration of three months is a standard recommendation in clinical practice to ensure complete resolution of the deficiency and to minimize the risk of relapse.