Guarana (Paullinia cupana Mart.) is a Brazilian native plant, the seeds of which are the only part suitable for human consumption. Guarana seeds derivatives are used as ingredients of a variety of phytopharmaceutical products. Guarana has been shown to be an aphrodisiac and analgesic, and to produce bronchodilator effects over the cardiovascular, respiratory, and nervous systems. Guarana seeds contain high concentrations of caffeine (approximately 3-6%), very small amounts of theophylline and theobromine and large quantities of tannins [83, 84].
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If you suffer with asthma, you will no doubt be familiar with the uncomfortable sensations as your bronchial tubes begin to narrow and your muscles around them start to tighten. A sticky mucus known as phlegm begins to produce and increase within your bronchial tubes and you begin to wheeze, cough and struggle to breathe.