Took my Autistic daughter with Pernicious Anemia to a NEW doctor yesterday. We live in the USA. The doctor is a specialist in Gastroenterology and immunology. She spent two hours with us and listened to our story. When I told her that we did loading doses for 7days she was shocked! She said the primary doctor was doing something very experimental and it could be dangerous?? Can't tell you exactly what her reasoning was but something about if other levels are off and you are putting too much B12?? I did get alittle nervous😆 She did get us an appt with a genetics specialist and she is doing a endoscopy and colonoscopy in April.