Meijuan Yan, M.D., M.S., is a board-certified Endocrinologist, who has been serving the Lancaster community since 2007. She also studied at the University of Missouri-Columbia and has a Master's degree in Nutritional Sciences. Her special interest in Nutrition has helped her to manage patients with diabetes mellitus. She also treats a wide variety of endocrine diseases that include osteoporosis, thyroid and parathyroid disorders, pituitary gland disease, adrenal gland disease and low testosterone. She believes that every person is unique and deserves individualized care to achieve a maximal health both in body and mind.