guaraná
Quick Facts
- What it is: Guaraná is a caffeine-rich Amazonian seed taken for energy and alertness.
- Main uses: Tiredness and low energy, Alertness and focus, Sports performance, Weight loss blends
- Active ingredients: Caffeine, Theobromine, Theophylline, Tannins and catechins, Saponins
- Forms: Seed powder, Capsules and tablets, Liquid extract, Sodas and energy drinks, Gels, chews and gums
- Time to effect: 30 to 60 minutes
- Side effects: Jitters, poor sleep, fast heartbeat and stomach upset are common at higher doses.
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What is guaraná?
Guaraná is the seed of a climbing vine from the Amazon. The seeds are dried, roasted and ground. They are one of the richest natural sources of caffeine.
People take it for energy, focus and alertness. By weight, the seed carries more caffeine than a coffee bean. A small scoop can hold a big dose.
The short verdict: the caffeine in guaraná does what caffeine does. It can lift alertness and push back tiredness for a few hours. Claims beyond that, such as weight loss or lasting energy, rest on thin human evidence.
Guaraná has a long, well documented history in Amazonian Brazil. Long use is not proof that a remedy works, and it is not proof that it is safe. This page keeps the two apart.
How does guaraná work?
Guaraná works mainly through caffeine.
Caffeine blocks adenosine, a brain chemical that builds up through the day and makes you feel sleepy. That effect is well proven in people. It is why alertness rises and tiredness fades for a few hours.
Caffeine also nudges up adrenaline. That is why your heart may beat faster and your hands may shake. Blood pressure can rise a little, more so if you rarely take caffeine.
Guaraná seed is also high in tannins. Some researchers think tannins slow how fast the caffeine is released. The idea of a smoother, longer lift is popular, but human proof for it is weak.
In test tubes and in animals, guaraná extracts show antioxidant activity, meaning they mop up reactive molecules. Lab work also reports effects on fat cells and on some cancer cell lines. None of that has been shown to matter in people.
Lab tests also point to antiplatelet action (the blood cells that form clots clump less readily). Whether this happens in the body is not established.
Tolerance matters too. With daily use your body adjusts, and the same dose does less. At that point much of the lift is simply holding off withdrawal.
What forms does guaraná come in?
Guaraná is sold in many forms, and the caffeine dose varies a lot between them.
Powders and pills:
- Dried seed powder, stirred into water or juice. - Capsules and tablets of seed powder or extract. - Liquid extracts and tinctures.
Drinks and snacks:
- Brazilian guaraná sodas and energy drinks. - Energy gels, chews, gums and bars. - Hard bars of roasted paste, grated by hand in Brazil.
Concentrated extracts can be many times stronger than plain powder. Labels do not always state the caffeine content.
Guaraná is often blended with other stimulants. Common partners are green tea, yerba mate, taurine and bitter orange. Blends make it hard to know how much caffeine you are taking.
Where it comes from:
The Sateré-Mawé people of the Brazilian Amazon grew and used guaraná long before Europeans arrived.
They roasted and ground the seeds, then pressed the paste into hard bars. The bar was grated into water with a stone or a fish-bone rasp. The drink was taken before hunting, long walks and heavy work.
Traditional healers also used it for tiredness, headache, fever and stomach upset. It held a place in trade and in ceremony.
European traders carried guaraná to Europe in the 1800s. Chemists there identified its caffeine.
Guaraná soda became a national drink in Brazil during the 1900s. Today most of the crop goes into drinks and supplements.
Who should avoid guaraná?
- Do not use if you have a heart rhythm problem, such as an irregular or racing heartbeat.
- Do not use if you have high blood pressure that is not under control.
- Do not use guaraná supplements or energy drinks if you are pregnant or breastfeeding.
- Never give guaraná supplements or energy drinks to children or teenagers.
- Do not use if you take clozapine (an antipsychotic medicine) or theophylline (an asthma drug).
- Do not use if you take an MAOI antidepressant, such as phenelzine or tranylcypromine.
- Avoid it if you have an anxiety disorder or panic attacks, as caffeine can trigger symptoms.
- Avoid it if you have a peptic ulcer (a sore in the stomach lining) or bad reflux.
- Avoid it if you have epilepsy (a seizure disorder), unless your doctor agrees.
- Avoid it in the two weeks before planned surgery, unless your surgeon says otherwise.
- Avoid all caffeine for 12 to 24 hours before a heart stress test.
- Do not take it with other stimulants, such as bitter orange, ephedrine or caffeine tablets.
When should you see a doctor?
Stop guaraná and see a doctor if you get lasting heart palpitations, chest tightness, new anxiety or panic, or insomnia that will not shift.
Also see a doctor if your blood pressure readings climb, or if you need it just to feel normal.
Call emergency services if you have chest pain, fainting, a fast and irregular heartbeat, repeated vomiting, confusion or a seizure. These can signal caffeine poisoning, which is most likely with high-dose supplements or energy drinks.
Is guaraná legal where you live?
In most countries guaraná is an ordinary food and supplement ingredient.
It is used in United States soft drinks under food rules, and sold in the UK and EU as a food supplement. Drinks with high added caffeine must carry a label warning in the UK and EU, stating they are not suitable for children or pregnant women.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
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