Recovery from adverse noncancer health effects may occur in some circu
mstances after cessation of exposure or after adaptation to continuing
low-dose exposure. In this overview, factors that influence the rever
sibility of toxic effects of environmental chemicals are presented, us
ing examples derived from toxicity to the reproductive system. Aspects
that must be considered include exposure scenario, stage of the life
cycle at which exposure occurs, and the nature of the toxicity. Select
ed categories of reproductive effects are considered briefly with resp
ect to potential for recovery. Finally, the incorporation of reversibi
lity into risk assessments is discussed.