What supplements promote bone fusion growth?

None known: I am not aware of any supplements that have been specifically shown to promote bone fusion growth. You do need, of course, protein and calcium and vit d for bony healing, but these can be obtained from a good diet as well as sunlight. More important is to avoid or control factors that inhibit bone healing, such as smoking, diabetes, and nsaids (i.e. Ibuprofen, aleve).