Guarana Seed Extract

<p>As guarana is rich in caffeine, it is of interest for its potential effects on <a href="http://en.wikipedia.org/wiki/Cognition" title="Cognition">cognition</a>. In <a href="http://en.wikipedia.org/wiki/Rat" title="Rat">rats</a>, guarana increased memory retention and physical <a href="http://en.wikipedia.org/wiki/Endurance" title="Endurance">endurance</a> when compared with a <a href="http://en.wikipedia.org/wiki/Placebo" title="Placebo">placebo</a>.<sup id="cite_ref-15" class="reference"><a href="http://en.wikipedia.org/wiki/Guarana_seed_extract#cite_note-15">[15]</a></sup></p>

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As a <a href="http://en.wikipedia.org/wiki/Dietary_supplement" title="Dietary supplement">dietary supplement</a>, guarana is an effective stimulant:<sup id="cite_ref-1" class="reference"><a href="http://en.wikipedia.org/wiki/Guarana_seed_extract#cite_note-1">[1]</a></sup> its seeds contain about twice the concentration of <a href="http://en.wikipedia.org/wiki/Caffeine" title="Caffeine">caffeine</a> found in coffee beans (about 2–4.5% caffeine in guarana seeds compared to 1–2% for coffee beans).<sup id="cite_ref-2" class="reference"><a href="http://en.wikipedia.org/wiki/Guarana_seed_extract#cite_note-2">[2]</a></sup></p>