To increase white blood cell (WBC) production, focus on a nutrient-rich diet with vitamins C, E, and zinc, found in citrus fruits, nuts, and lean meats. Regular exercise, adequate sleep, and stress reduction support immune health. Bone marrow stimulants like granulocyte colony-stimulating factor may be prescribed for medical conditions. Consult a healthcare provider before using supplements or medications, such as a cephalexin supplier for infections, as antibiotics do not directly boost WBC but treat underlying issues. Avoid smoking and excessive alcohol, which suppress immunity. Hydration and avoiding infections are key to maintaining healthy WBC levels naturally.