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Does green tea extract cause high blood pressure?

Meta-analysis showed that green tea consumption caused a significant reduction in systolic blood pressure and total and LDL cholesterol. The effects on diastolic blood pressure, HDL cholesterol, and triglycerides were not significant.

cebm.ox.ac.uk - Green tea and blood pressure effects - Centre for Evidence-Based Medicine

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Many different dietary supplements are marketed, but the evidence for effectiveness is mixed. Green tea is one of the most common beverages. Green tea extracts are thought to possess antioxidant and ACE-inhibitor properties. Green tea polyphenols also inhibit the absorption of lipids from the intestines and facilitate the conversion of cholesterol into bile acids. Epidemiologic studies have shown that green tea has a cardioprotective effect and evidence synthesis has shown that consumption of green tea is associated with blood vessel relaxation. To evaluate the effect of green tea consumption on blood pressure and lipid profile, we appraised and synthesized the evidence from clinical trials evaluating the effect of green tea on blood pressure and lipid profile. We searched five electronic databases and included only double-blinded randomised clinical trials (RCTs). We also assessed the reporting quality of included studies. We identified 38 eligible studies, out of which we included 20 RCTs with over 1,500 participants. Overall, the studies were of moderate quality. Meta-analysis showed that green tea consumption caused a significant reduction in systolic blood pressure and total and LDL cholesterol. The effects on diastolic blood pressure, HDL cholesterol, and triglycerides were not significant. We also observed that the maximum effects of green tea occurred when the daily intake of epigalocatechin-3-gallate (the most abundant and bioactive compound in green tea extracts) was approximately 200 mg which equates to 5-6 cups of tea daily. Above this dosage, adverse events appeared to be more frequent and more severe.

Impact

Daily consumption of 5-6 cups of green tea could result in reductions in systolic blood pressure, total cholesterol, and LDL cholesterol. Green tea should not be recommended as a substitute for current management of patients with established hypertension or dyslipidaemia. Green tea appears to be well tolerated, but consumption in high doses may be associated with adverse events. There is uncertainty about the effects of prolonged green tea intake; therefore, longer-term independent clinical trials warranted.

Publications

The effect of green tea on blood pressure and lipid profile: a systematic review and meta-analysis of randomized clinical trials. Onakpoya I, Spencer E, Heneghan C, Thompson M. NMCD http://dx.doi.org/10.1016/j.numecd.2014.01.016

Associated media

WorldHealth.Net – Green Tea Supports Heart Health.

Nutraingredients-usa.com – Green tea may offer blood pressure and cholesterol benefits, but too early for recommendations, says meta-analysis.

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How much caffeine is in green tea extract?

That's why green tea extract was selected. It fulfills the “need a pick-me-up” component via a small amount of naturally occurring caffeine (about 15 mg per serving), but, more importantly, green tea extract provides benefits far exceeding that.

hammernutrition.com - Green Tea Extract in Fully Charged—Much More than a Caffeine Source

BY STEVE BORN

While working on the Fully Charged formula, I knew that it needed a little bit of a kick—something that would provide a quick-acting burst of mental and physical energy, and give the user the distinct feeling that “something’s happening here.” A little caffeine in the product would do the trick, but just adding “X” amount of synthetic caffeine wasn’t something I was interested in. “Too many products just dump lots of caffeine in their product,” I thought, “and that’s not what the Fully Charged formula is going to be about.” That’s why green tea extract was selected. It fulfills the “need a pick-me-up” component via a small amount of naturally occurring caffeine (about 15 mg per serving), but, more importantly, green tea extract provides benefits far exceeding that. That’s because green tea contains polyphenols such as catechins—including an especially important one known as epigallocatechin gallate (EGCG)—which provide antioxidant and cardiovascular health support. A recent study reported in the Journal of Biological Chemistry adds to the increasing amount of research showing just how beneficial green tea extract—primarily its EGCG component—can be. The conclusions of research from Lancaster University and the University of Leeds suggest that EGCG may greatly benefit arterial health. Atherosclerosis is defined as the build-up of fats, cholesterol, and other substances in and on the artery walls; and, in their research, EGCG was found to help dissolve the plaque associated with heart attack and stroke due to specific binding and conversion properties. Each serving of Fully Charged contains 100 mg of green tea extract, standardized to contain no less than 50% polyphenols. That means you get a precise amount of all of green tea’s beneficial compounds, including EGCG, in each and every serving.

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