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“Guarana, which contains caffeine in addition to small amounts of theobromine, theophylline, and tannins , is also recognized as safe by the FDA, although it may lead to caffeine toxicity when combined with caffeine.”
The Physician and sportsmedicine • 2010 | View Paper
“The binding of tannin to the cell debris and of protein to the adsorbed tannin can be prevented by addition of serum albumin, Carbowax 4000, nicotine, or caffeine to the extraction medium.”