The Kallel Foundation is a non-profit organisation that aims to speed up the discovery and development of treatments that extend human healthspan, the number of years people live in good health, and reduce age-related disease.

Its work focuses on three main areas: repurposing existing generic drugs that could slow ageing, rejuvenating mitochondria, the energy-producing parts of cells, and identifying new longevity mechanisms by studying species that live unusually long lives. The foundation also promotes more open access to longevity research. It was founded by neuro-oncologist Stephen Clark, who serves as its chief scientist, and supports research aimed at moving promising, affordable interventions towards testing in people.