Guarana (Paullinia cupana) is an Amazonian plant whose seeds are naturally high in caffeine. The caffeine content can be 2 to 4 times that of coffee beans by weight. People take it to sharpen mental alertness and ease fatigue, much like caffeine from other sources. Many use it during low-energy spells or when they need a focus boost. It comes in capsule, tablet, or powder forms, typically taken in the morning or early afternoon to keep sleep on track.
Caffeine levels can vary widely between products. Too much may cause jitteriness, sleeplessness, or a racing heart. Pregnancy and breastfeeding: avoid it because of the high caffeine. Safe upper limits mirror those for plain caffeine. Consult a healthcare provider before mixing guarana with other stimulants.