Anagathic

Anagathics are drugs and treatments that halt and reverse the progress of aging. Human, renlai, first or other, all beings short of the Delta strain or their alien equivalents require some form of maintenance to be truly immortal. For Homo Panacea, this is required after two to six cycles, depending on how badly the body has been abused. Homo supernus outlasts homo excelsior in this regard, at least for comparable levels of activity.