Abstract: The invention generally relates to a method of regenerating a nerve fiber in a damaged neural tissue of a patient, the method comprising the steps of: administering an aqueous formulation comprising superparamagnetic particles to the damaged neural tissue in the patient; applying a magnetic field in an orientation which is parallel to the nerve fiber; using the magnetic field for aligning the superparamagnetic particles; forming one or more aligned chains of the superparamagnetic particles in the magnetic field as a scaffold to guide directional growth of regenerating nerve cells; and reconnecting damaged nerve ends in the damaged neural tissue of the patient.