Hi, Low hemoglobin levels in the blood caused by Iron deficiency sometimes impair sperm quality, testosterone production, and testis architecture which affects fertility. Mechanisms involved being Oxidative stress, Decreased enzymatic actions and others.
It is necessary to consult an Andrologist to evaluate the patient and find out where exactly the problem lies.
Natural remedies to increase sperm quantity and count are pretty simple and important. Quit smoking and alcohol, get good sleep and exercise, take a diet rich in antioxidants, avoid fatty foods, and drink adequate water and fluids to keep yourself hydrated.