I've read in Dr. Jones' book that often the use of light therapy has been shown to help patient's itching. It has been used for years in newborns to help break down neonatal jaundice. It's thought to break down the jaundice pigment in the skin.
The trick is the decide how much sunlight or light therapy should be used as it can obviously make some more prone to skin cancer. Formal light therapy has been used though on patients. The thought being that it breaks down the molecules causing the itch - possibly the bile acids.
They have seen patients whose itching is greatly helped when receiving their light therapy -only to have it return when they are 'taking a break' from it.
Have any of you found the sun helps the itching? I know for me if I was in the sun to the point of sweating, that almost always caused me to itch. So many of us really do experience PBC differently, don't we?