I was losing hair also. I think mine was due to taking imuran. I am 38 years post transplant. I have a lot of issues with N skin cancers. A lot of years on all of the transplant meds. All have been easily removed. My dermatologist suggested I start taking Niacinamide for my skin. After taking it for around 3 months, my hair completely stop falling out. I take a tablet in the morning and 1 at night. My transplant doctors told me it was OK for me to take it. Still a good idea to ask your doctors about it. My hairdresser could not believe there was no hair in the sink. She has told a lot of her clients about it. I order mine on Amazon.