The Short Version
The evidence does not yet support this broad claim. While taurine has a plausible biological mechanism (acting on GABA and glycine receptors) and consistent animal-model results, the only notable human clinical evidence comes from a single small trial in first-episode psychosis patients using taurine as an add-on to standard treatment — not as a standalone supplement for general mood support. Authoritative sources, including ColumbiaDoctors, explicitly state that randomized clinical trials are still needed to determine whether taurine supplements improve health in humans.