Calcium: Captain Calcium Captain Calcium is the leader of the Bone Health Triangle™ superhero team. His power is to integrate calcium into bones and teeth to make them strong. The Captain has one weakness. Without K2‑activated MGP proteins, his calcification superpowers can get out‑of‑hand, calcifying soft tissues in the body. Activated MGP binds Captain Calcium so that he won’t be deposited in arteries. K2‑activated MGP prevents Captain Calcium from transforming into an artery‑calcifying supervillain.