Steady-state levels of three stilbene compounds in treated C. elegans adults did not correlate with toxicity. Animals were treated for two days with a toxic dose (100 μM) of indicated compound in the medium. After collection, stilbene levels determined as described in methods. Compounds were measured in two independent samples for each treatment with paired negative control. Averages and SDs between both measurements are shown; statistical significance was determined by t-test.