B12
You can take them. You just won't have to take them as often. B12 is a vitamin we don't have to take every day. If you were going to take the 500 mcg every day, you can take them 5000 mcg once every 10 days instead.
Please note: I AM NOT A DOCTOR. If you want medical advice, talk to your doctor. Whatever I post, there is probably some surgeon or other health care provider somewhere that disagrees with me. If you want to know what your surgeon thinks, then ask him or her. Check out my blog.