Originally derived from the nigh-transcendent biotech of the Jonori, Evergreen skirts the boundaries of anagathic tech as it brings the aging process to not just a halt, but a reversal. Tuned to plantoid biology, the condensed liquid slurry incorporates expendable nanotech to repair cellular damage and effectively reduce the user's biological age during its duration. Now considered quaint in the paradise-worlds of its origin and maddeningly miraculous amidst the rest of civilized space, Evergreen finds limited but steady production among high TL worlds that specialize in medical technology. The limited but consistent market for Evergreen has led to variants of the formula for other sophont biologies being engineered by megacorps and kit-bash labs alike. Long-term users tend to supplement this drug with "stalling" anagathics in an effort to save money and age. The reversed aging is in direct proportion to the duration spent taking the drug, with each day of use repairing enough damage to constitute one day of reversed age. The effect cannot reverse great changes in bodily development. The most notable example of this is puberty, which forms a hard limit of young maturity as the greatest possible rejuvenated age for adult users. Other significant limits include degeneration associated with old age, as well as a multitude of minute limits in childhood. The old can still rejuvenate to a state approximating late middle-age. In children the limits are consistent enough that they can only rejuvenate to a state approximating the beginning of their current stage, such as adolescence or middle childhood, with any doses beyond that merely serving to halt the aging process.