On the interaction of caffeine and taurine, I owe you an answer in a nutshell. The European Food Safety Authority has looked at that, and I recall one sentence from the summary report, to answer your question. They said that “...it was unlikely that d-glucuronolactone would have any interaction with caffeine, taurine, alcohol or the effects of exercise”. So they looked at potential interactions with all the substances, plus alcohol and physical exercise.
On June 8th, 2010. See this statement in context.