Calcium

Calcium is a chemical element, number 20 on the periodic table. 

During a scan of Aldean DNA in 2364, Doctor Beverly Crusher was able to confirm that inefficiencies in calcium resorption was not responsible for the Aldeans' sterility. 

Calcium left trace patterns by which a Doctor could establish a time period in which bones were broken. Beverly Crusher used this method to learn that Jono had broken his arm and fractured two of his ribs in 2360. 

A sudden decrease of serum calcium levels increased muscle spasm. This was a side effect of radiation poisoning. The pain caused by this could be counteracted by asinolyathin. Chief Miles O'Brien suffered from this when he had his visions in 2371.