This is limited information and more precise information is needed about your skin condition which can help in planning a treatment. A thorough history, clinical examination and appropriate laboratory tests will be needed to answer your query. Such supplementation advises need inputs from the patients. If you are a non vegeterian, recommendation will be different. If there is a skin condition that needs those supplements, than dosage will be diferent. IN short it is good to supplement vitamins for 2-3 months and rotate with something different under the supervision of your doctor.