@mannism, The tacrolimus ointment is sometimes prescribed for repigmentation due to vitiligo. When I inquired about using if for my vitiligo several years ago, my dermatologist did not want me to use it because he was concerned that it might interfere with my stable tacrolimus levels of my immunosuppressioj for my liver and kidney transplant.

If you are a transplant recipient, please check with your medical team in case there is any effect. I decided not to proceed with using it.
How is your hair growth? How lonfg have you used it, and how often?