Abstract
The Caenorhabditis Intervention Testing Program recently characterized the longevity-promoting effects of the vitamin A derivative all-trans retinoic acid (atRA). Here, we test two atRA-related compounds, tamibarotene and bakuchiol, for longevity effects in three strains of Caenorhabditis species. Both tamibarotene, a potent RAR agonist, and bakuchiol, a meroterpene derived from Psoralea corylifolia , showed no significant increase in lifespan across a dosage range of six concentrations. Additionally, bakuchiol was broadly toxic at higher doses. These findings highlight the specificity of atRA's longevity effects and suggest that compounds related to atRA may not universally promote lifespan extension.