GradedHealth

Does black tea lower blood pressure?

Yes, slightly: pooled trials show black tea lowers systolic blood pressure by about 1 to 2 mmHg. It does not reliably lower cholesterol.

Published October 2026

Short answer

Yes, slightly: pooled trials show black tea lowers systolic pressure by about 1 to 2 mmHg, more in some people with high blood pressure, but the trials are small and short, and cholesterol results are inconsistent. Evidence grade C (Limited). Meta-analyses of small randomised trials (about 400 people each); downgraded for surrogate marker and small total sample; effect only 1-2 mmHg.

Key takeaways

  • A 2021 meta-analysis of 13 trials found black tea lowered systolic blood pressure by 1.04 mmHg and diastolic by 0.59 mmHg [1].
  • An earlier analysis of 11 studies (378 people drinking 4 to 5 cups a day) found drops of 1.8 and 1.3 mmHg [2].
  • In people with elevated blood pressure, green or black tea lowered systolic pressure by 4.81 mmHg, with green tea stronger than black [3].
  • Cholesterol results were mixed: LDL fell 4.64 mg/dL in one analysis, but not in another of 15 trials or in people with high cholesterol [4][5][6].
  • No credible harm was found at typical intakes, with up to eight cups a day suggested as a caffeine ceiling [7].

The short version

Yes, slightly: black tea lowered blood pressure by about 1 to 2 mmHg in pooled trials, a small drop that matters more across a whole population than for one person [1][2]. The drops were bigger in people with high blood pressure when green tea was included, but the trials were small and short [3]. Black tea did not lower cholesterol consistently [5][6].

What the studies show

Blood pressure. A 2021 meta-analysis of 13 randomized trials found black tea lowered systolic (upper) pressure by 1.04 mmHg and diastolic (lower) pressure by 0.59 mmHg compared with control, and the effect did not clearly depend on dose or duration [1]. An earlier meta-analysis of 11 placebo-controlled studies (378 people drinking 4 to 5 cups a day) found drops of 1.8 mmHg systolic and 1.3 mmHg diastolic [2]. In a 6-month trial of 111 people drinking 3 cups a day, black tea solids lowered the nighttime variation in blood pressure by about 10% compared with a caffeine-matched drink [8].

People with high blood pressure. A meta-analysis of 5 trials (408 people with elevated blood pressure or hypertension) found regular green or black tea lowered systolic pressure by 4.81 mmHg (95% CI 1.58 to 8.40) and diastolic by 1.98 mmHg, with longer use (3 months or more) working better and green tea stronger than black tea [3]. A Cochrane review found green and black tea together lowered systolic pressure by 2.25 mmHg and diastolic by 2.81 mmHg, but only a few trials were included and some were at risk of bias [9].

Cholesterol. One meta-analysis of 10 trials (411 people) found black tea lowered LDL cholesterol by 4.64 mg/dL with no change in total or HDL cholesterol [4]. A meta-analysis of 15 trials found no significant effect on total cholesterol, and the LDL drop in healthy people was not significant in the random-effects analysis [5]. In people with high cholesterol, black tea made no significant difference to any blood fat in 6 trials [6].

Heart health in tea drinkers. In a meta-analysis of 22 prospective studies (856,206 people), 3 more cups of tea a day was linked to 18% lower stroke risk (relative risk 0.82) and 24% lower total mortality (0.76) [10]. For black tea specifically, an analysis of 18 cohorts linked the highest intake to 10% lower all-cause mortality (0.90, 95% CI 0.83 to 0.98) [11].

The nuances

Small effects. One to two mmHg is a modest drop, and the trials had few participants [1][2].

Cohorts show links, not cause. Studies of tea drinkers cannot prove tea is the reason, and a dose-response review rated the strength of evidence low for most outcomes [12].

Caffeine and iron. A review found no credible evidence that black tea in typical amounts was harmful, with a maximum of eight cups a day suggested to keep caffeine in check [7]. The same review found no evidence that tea drinking harms iron status unless people are already at risk of anaemia [7].

What this means for you

Black tea is a low-risk drink that may nudge blood pressure down slightly, but the evidence does not support it as a treatment for high blood pressure [1][9]. If you are managing blood pressure, medication and lifestyle changes matter more, so talk to your doctor. For more, see Black Tea, Green Tea and Caffeine.

Go deeper

  • Black Tea — Regular black tea lowered systolic blood pressure by about 1 to 2 mmHg in pooled trials, and tea drinkers have lower cardiovascular and total mortality in coho…
  • Green Tea — Small drops in weight and blood pressure in trials, with a small extra weight loss when combined with exercise.

References

  1. The effect of black tea supplementation on blood pressure: a systematic review and dose-response meta-analysis of randomized controlled trials.. Food Funct, 2021.
  2. The effect of black tea on blood pressure: a systematic review with meta-analysis of randomized controlled trials.. PLoS One, 2014.
  3. The effects of regular consumption of green or black tea beverage on blood pressure in those with elevated blood pressure or hypertension: A systematic review and meta-analysis.. Complement Ther Med, 2020.
  4. Black tea consumption and serum cholesterol concentration: Systematic review and meta-analysis of randomized controlled trials.. Clin Nutr, 2015.
  5. Effect of black tea consumption on blood cholesterol: a meta-analysis of 15 randomized controlled trials.. PLoS One, 2014.
  6. Effectiveness of black tea versus placebo in subjects with hypercholesterolemia: A PRISMA systematic review and meta-analysis.. Diabetes Metab Syndr, 2019.
  7. Black tea--helpful or harmful? A review of the evidence.. Eur J Clin Nutr, 2007.
  8. Black tea lowers the rate of blood pressure variation: a randomized controlled trial.. Am J Clin Nutr, 2013.
  9. Green and black tea for the primary prevention of cardiovascular disease.. Cochrane Database Syst Rev, 2013.
  10. Tea consumption and risk of cardiovascular outcomes and total mortality: a systematic review and meta-analysis of prospective observational studies.. Eur J Epidemiol, 2015.
  11. Tea consumption and mortality of all cancers, CVD and all causes: a meta-analysis of eighteen prospective cohort studies.. Br J Nutr, 2015.
  12. Dose-Response Relation between Tea Consumption and Risk of Cardiovascular Disease and All-Cause Mortality: A Systematic Review and Meta-Analysis of Population-Based Studies.. Adv Nutr, 2020.