I too have had oral lichen planus under one side of my tongue for many years. Last year I was diagnosed with chronic kidney disease and the nephrologist rx’d Calcitriol to supplement OTC vitamin D that I was taking for osteoporosis, even though my calcium level was normal. A few weeks later, I noticed that my lesions were much improved. Mentioned this to my dentist (who first discoversed it) and he asked if anything had changed in meds and the only thing was the Calcitriol. I definitely credit this med with relieving me of all symptoms. It was a beneficial side effect for sure.