Herbs & botanicals
Guarana
Names you may see: paullinia cupana caffeine
The quick take
Guarana is a botanical source of caffeine used in some energy and weight-management products.
A closer look
What forms will I see on a label?
The amount of guarana extract is not the same as its caffeine amount. Look for declared caffeine content and the complete formula.
Why people use it
Used as a caffeine-containing ingredient in energy and weight-management products.
These are common goals and marketing uses. The evidence section below explains what research supports.
What does the evidence tell us?
A caffeine-containing blend can produce stimulant effects, but blend research cannot demonstrate an independent weight-loss benefit from guarana.
What should I know before using it?
Count its caffeine together with coffee, tea, energy drinks and pre-workouts. Sleep disturbance, anxiety and palpitations are reasons to reassess stimulant use.
Sources & further reading
NIH Office of Dietary Supplements ↗
Content reviewed: September 30, 2026
General educational information. Follow the product label and seek individual advice when needed.