No, my daughter isn’t underweight or run marathons. But, as an update, she started on oral vancomycin in february (she takes ANI brand, 250mg 4x a day) and, after two months, it brought all her levels back to normal…her LFTs, her cholesterol, her CA-19-9, everything!! And, after a year and a half of no periods, she started again after two months as well! I highly recommend it to everyone. All has been good for 6 months.