Greying of hair is genetic. As such there is no effective treatment for that. You can dye your hair. Keep you diet well balanced. Balanced means a diet which contains everything like milk, meat, egg, vegetables,fruit etc. You are at Sargodha. So I would suggest that you should consult Dermatologist of PAF Hospital Sargodha or Dr Amir Manzoor at Niazi Hospital. Consultation is always good for good assessment.