While reading the elegibility FAQ at the american red cross blood donation site, I ran across the following. Bolding mine.
Wait 12 months after receiving an organ or tissue transplant from another person. This includes bone and dental powder. If you are taking medications to prevent rejection of the organ or tissue you are not eligible to donate.
What in the name of god is dental powder? Or bone powder for that matter? I am pro donation, and have ticked for “tissues”, but I really would like to know what this is.