We interrogated whether optoacoustic tomography could be employed to study blood flow kinetics and bio-distribution of injected fluorescent agents in humans. Using a 128-channel scanner at a frame rate of 10 images per second, we obtained cross-sectional images of the human finger, before and after the administration of Indocyanine Green (ICG). We demonstrate that multi-spectral optoacoustic tomography (MSOT) can sense fast flow kinetics and resolve spatio-temporal characteristics of a common fluorochrome in human vasculature at clinically relevant concentrations. We further register ICG images with oxygen saturation maps and anatomical views of the proximal interphalangeal joint of a healthy volunteer.