Metaphasic radiation

Metaphasic radiation is a form of energy which has regenerative effects and can, under certain conditions, reverse the aging process of some humanoid species.

The planet Ba'ku's rings contained a high level of metaphasic radiation. 

In 2374, Doctor Carol Murphy and Captain Jonathan Masters were exposed to a freak wave of metaphasic radiation that radiated out of a collapsing subspace tear. (: "Regression")