Low doses of the drug lithium appear to have a potential impact on prolonging longevity, in short-lived fruit flies at least (and under laboratory conditions).
Lithium study helps scientists unlock ageing puzzle. London: BBC Health News / BBC Science and Environment News, April 7th 2016.
This relates to:
Castillo-Quan, JI. Li, Li. [and] Kerri, J. [et al] (2016). Lithium promotes longevity through GSK3/NRF2-dependent hormesis. Cell Reports. April 2016. [Epub ahead of print].