Moreover, its caffeine content aids blood flow to the skin Test-tube studies have shown that the antioxidants in guarana may significantly reduce age-related skin damage 9. Guarana has antioxidant and antimicrobial properties, making it a common additive in cosmetic products.
It may aid blood flow to your skin, reduce damage linked to aging and minimize undesirable features, such as saggy skin and wrinkles. Animal and test-tube studies suggest that guarana may protect against DNA damage, suppress cancer cell growth and even trigger cancer cell death 34 , 35 , Another test-tube study found that guarana suppressed the growth of cancer cells in the colon, as well as stimulated their death Scientists believe that the potential anti-cancer properties of guarana stem from its content of xanthines, which are compounds that are similar to caffeine and theobromine.
That said, though the results of test-tube and animal studies are promising, more human-based research is needed. Animal and test-tube studies have found that guarana may have anti-cancer properties.
However, human-based research is required before recommending guarana for treatment. One of these bacteria is Escherichia coli E. Most E. Studies have also found that guarana can suppress the growth of Streptococcus mutans S.
Guarana contains compounds that may inhibit or kill harmful bacteria, such as E. Things like sunlight, poor diet and certain lifestyle choices like smoking can wear down your eyes over time and increase your risk of eye-related disorders Guarana contains compounds that fight oxidative stress, a major risk factor for age-related eye disorders like macular degeneration, cataracts and glaucoma One study found that people who consumed guarana regularly had better self-reported vision than people who consumed it sparingly or not at all In the same study, scientists performed test-tube experiments to discover if guarana could protect eye cells against compounds that create oxidative stress.
Guarana significantly reduced the amount of DNA damage and eye cell death, compared to a placebo That said, there is limited research in the area of guarana and age-related eye disorders. Test-tube studies have found that guarana may combat oxidative stress, which is linked to age-related eye disorders. However, this area of research is limited, so more human-based studies are needed before providing recommendations.
Research shows that guarana has low toxicity in low-to-moderate doses 19 , 46 , In high doses, guarana may cause side effects similar to those of excessive caffeine intake , including 48 , 49 :.
Pregnant women should avoid or limit guarana intake, as caffeine can cross the placenta. Too much caffeine may cause growth abnormalities in your child or increase the risk of miscarriage Although guarana has no recommended dosage, most human-based research has found that doses as low as 50—75 mg can provide the health benefits linked to guarana 16 , Guarana appears to be safe and is widely available.
In high doses, it may have similar side effects to those of excessive caffeine intake. Guarana is commonly touted for its ability to reduce fatigue, boost energy and aid learning and memory. It has also been linked to better heart health, weight loss, pain relief, healthier skin, lower cancer risk and a decreased risk of age-related eye diseases. Most research shows that doses between 50—75 mg of guarana are sufficient to provide you with health benefits, though there is no official dosage recommendation.
Whether you want to boost your energy levels or simply improve your overall health, guarana may be worth a try. Caffeine is a natural stimulant consumed throughout the world.
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Caffeine can have impressive health benefits, but high doses can also lead to unpleasant side effects. Silva , Lucas N. Almeida , Roberto A. Azevedo ,. International Journal of Microbiology , , Teixeira , Ivana B. Ribeiro , Danieli M. Turra , Raquel S. Praia , Fernanda Barbisan , Audrei O. Alves , Douglas K.
Sato , Charles E. Barcelos , Igor M. Safety indicators of a novel multi supplement based on guarana, selenium, and L-carnitine: Evidence from human and red earthworm immune cells. Food and Chemical Toxicology , , Nutrients , 12 4 , Pair your accounts.
Your Mendeley pairing has expired. Please reconnect. Today, guarana seeds are ground to a fine powder and sold as powder, tablets, and capsules. This review focuses on the traditional uses, phytochemistry, and biological activities of the guarana seed to evaluate its safety as a dietary ingredient. A comprehensive review of published literature was conducted to identify articles that focused on the phytochemistry, pharmacology, and safety of guarana.
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