content: I doubt a bacteria which survives and thrives in concrete would be able to survive inside a human body, it a very different environment with a lot more challenges. The costs would likely be low if it can be cultured and put into stone dust bags at manufacturies. As for the growing outside of it's concrete home that is the real test, likely it needs oxygen to grow the crystalline structures which block up the gaps so the inside of the concrete would be fine but if a cracked outer surface was very badly damaged I can only guess that a rogue growth might disturb the structure.