Across all 4 studies, green tea showed beneficial effects on systolic blood pressure, with predominantly small effect sizes (3 small, 1 large). The median study duration was 90 days (based on 1 study). Populations included healthy adults and those at high risk of cardiovascular disease, but doses varied widely across studies, making it difficult to identify a specific effective dose range.
Caveats: Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). Additionally, doses varied widely across studies, and the median study duration is based on only one study, limiting generalizability.
Adverse events were measured in five trials and included a diagnosis of prostate cancer, hospitalisation for influenza, appendicitis and retinal detachment but these are unlikely to be directly attributable to the intervention.
from: Green and black tea for the primary prevention of cardiovascular disease.Adverse events were measured in five trials and included a diagnosis of prostate cancer, hospitalisation for influenza, appendicitis and retinal detachment but these are unlikely to be directly attributable to the intervention.
from: Green and black tea for the primary prevention of cardiovascular disease.Adverse events were measured in five trials and included a diagnosis of prostate cancer, hospitalisation for influenza, appendicitis and retinal detachment but these are unlikely to be directly attributable to the intervention.
from: Green and black tea for the primary prevention of cardiovascular disease.Adverse events were measured in five trials and included a diagnosis of prostate cancer, hospitalisation for influenza, appendicitis and retinal detachment but these are unlikely to be directly attributable to the intervention.
from: Green and black tea for the primary prevention of cardiovascular disease.SBP: MD -3.18 mmHg, 95% CI -5.25 to -1.11
Green tea reduced SBP (WMD: -1.08 mmHg; 95% CI: -1.98, -0.18; I² = 85.0%)
Among women, green tea improved ... systolic blood pressure (SMD: -1.74)
green tea consumption was observed to have a beneficial impact on lowering both diastolic and systolic blood pressure