I really think you should take vitamin D3. It helps with balance - a lot! I have three medical journal articles about this very issue. Also, ask your PT for some exercises for balance and recovery - so if you start to fall you can right yourself. My PT did this for me. I can't tell you how much vitamin D3 to take - but get a blood test first to see where you are at. I like my D level to be up around 80 or 90. I started at 3. It took a long time of big doses (4,000 IU up to 10,000 IU) to build it up. I never get a cold or the flu (knock on wood). My balance is really wonderful considering how sickly I am. Ask your transplant team about it. You can get vitamin K2 from eating arugula and kale - K2 tells your body where to send the calcium. If you don't take K2, some doctors say the calcium can wind up in your arteries. I take a K2 supplement because I'm not always ready to eat kale (although I hide it in my veggie burgers).