A few cups a day add up more than you would think.
8 ingredients
Search within this categoryThe nutrients most often listed as a key nutrient among these ingredients.
Tea & drinks
Early researchAcross 10 randomised trials in 1,030 people, peppermint oil beat placebo. But adverse events were more frequent (RR 1.57), the authors stated the quality of evidence was very low, and what was tested was an enteric-coated capsule, not tea.
Tea & drinks
Moderate evidenceA meta-analysis of 12 randomised trials. Sleep quality improved significantly. Only one trial looked at insomnia, and in that one nothing changed.
Tea & drinks
Moderate evidenceA Cochrane review pooled 35 randomised trials and 1,804 people. Systolic fell 1.76 mmHg. In people with normal blood pressure, there was no significant difference.
Tea & drinks
Early researchAfter 14 days, a full 24-hour measurement showed fat oxidation up about 20%. Total energy expenditure was unchanged. The gap between those two sentences is the whole story.
Tea & drinks
Moderate evidenceAcross 26 randomised trials and 1,797 participants, blood pressure fell dose-dependently. The claim that it matches antihypertensive drugs is not what the data support.
Tea & drinks
Moderate evidenceAcross 13 randomised trials, systolic blood pressure fell 1.04 mmHg. Statistically significant, and too small for one person to feel.
Tea & drinks
Moderate evidenceThe association with lower type 2 diabetes and liver disease risk is consistent. The interesting part is that decaf shows almost the same thing.
Tea & drinks
Moderate evidenceCatechins and L-theanine keep showing up in cardiovascular and attention research. What decides the result is your water temperature and when you drink it.