Rigidium

Rigidium is an element, appearing in the 1987-1996 series. According to Krang in the season 4 episode The Big Zipp Attack, it is the strongest metal in the Universe.[https://www.springfieldspringfield.co.uk/view_episode_scripts.php?tv-show=teenage-mutant-ninja-turtles-1987&episode=s04e22 The Big Zipp Attack at Springfield! Springfield!]

The Zipps double when eating it. Choccolate works in the opposite way. Chocolate works in the opposite way.