Guarana

The seed of this climbing plant, native to the Amazon and widespread throughout South America, is used. It contains alkaloids, xanthines (caffeine 1 to 7%, theobromine 0.01 to 0.2%, and theophylline 0.01 to 0.3%) and tannins. Attributed properties: nervous system stimulant, diuretic, bronchodilator. Indications approved by the European Medicines Agency ^{(EMA 2013)}: states of fatigue and weakness. Component of many brands of energy drinks, infusions, capsules and tablets for energising and slimming purposes. ^{(Schimpl 2013, Woods 2012)}

At the date of the last update, we found no published data on its excretion in breast milk, but it is known that xanthines are excreted in breast milk, so it is not advisable to exceed the equivalent of 300 mg of caffeine per day during breastfeeding.

Guarana seeds contain four times more caffeine than coffee beans. ^{(Moustakas 2015)}

Inappropriate or excessive consumption can cause hypertension ^{(Jalili 2013, Moaddeb 2011, Arditti 2002)} and has led to cases of convulsions and cardiac arrhythmias due to intoxication. ^{(Ciszowski 2014, Pendleton 2013)}

Moderate consumption is acceptable during breastfeeding; it is advisable to monitor for signs of irritability, nervousness or insomnia in the infant.

See below the information of these related products:

• Caffeine (Fairly safe. Mild or unlikely adverse effects. Compatible under certain circumstances. Follow-up recommended. Read Commentary.)
• Coffee (Fairly safe. Mild or unlikely adverse effects. Compatible under certain circumstances. Follow-up recommended. Read Commentary.)