Guarana (Paullinia cupana) is an evergreen vine that can grow up to thirty feet in the Amazon rain forest. Guarana is never used as a single remedy but combined with other herbs for nutritional benefits. Guarana has been used for fatigue and headaches. The stimulatory effects of guarana are attributed to the caffeine in it. Caffeine may have a tendency to strength and speed up the heartbeat, relax blood vessels (except those in the brain), and open bronchial tubes. Caffeine discourages blood clots, stimulates the urinary system, and promotes digestive secretion.
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Cautions In moderate amounts, Guarana poses no threat to a healthy adult. Especially if you are already getting caffeine from other sources, use Guarana with caution if you have a heart condition, kidney disease, an overactive thyroid, a tendency to spasms, or problems with anxiety or panic.