Foods to Increase Hemoglobin Levels Iron, Folate and Vitamins B6, B12 are the required nutrients to create red blood cell, so make your diet healthy with these nutrients to keep hemoglobin level within the normal range. The standard hemoglobin levels in the blood are 14-18 mg/dl for Men and 12-16 mg/dl for Women. Low hemoglobin symptoms can include fatigue, mental cloudiness and increased weakness to infection, whenever severe, overall health is compromise