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  1. 13 de jun. de 2018 · In high doses, guarana may cause side effects similar to those of excessive caffeine intake, including (48, 49): Heart palpitations; Insomnia; Headaches; Seizures; Anxiety; Nervousness; Upset...

  2. 16 de jul. de 2023 · Guarana is a plant with high caffeine content, but processed guarana products lose its health benefits and may cause overcaffeination, sugar overload and other problems. Learn why guarana-laced energy drinks aren't a health food and how to limit your intake.

  3. 25 de jul. de 2023 · Severe side effects are possible, especially with large doses of guarana. Examples of severe side effects include: Serious allergic reaction : A severe allergic reaction is a profound side effect possible with any medication or natural product.

  4. Guarana is a plant native to the Amazon that contains caffeine and other stimulants. Learn about its uses, side effects, precautions, interactions, and dosing for various conditions.

  5. 7 de sept. de 2023 · Guarana side effects are similar to those resulting from caffeine. It may be safe for people without medical conditions to take guarana daily as long as they monitor their overall caffeine intake.

  6. 24 de jul. de 2023 · Guarana is a plant used as an herbal supplement with various possible benefits and risks. Learn about the common and rare side effects of guarana, such as stomach irritation, insomnia, increased heart rate, and bleeding disorders, and how to use it safely.

  7. 28 de sept. de 2022 · Guarana contains xanthines, like caffeine, catechins, tannins, and procyanidins. Though the individual effects of these compounds are known, more research is needed to determine how they interact in guarana.