The best teas to drink depend on what you’re looking for, but green tea, black tea, chamomile, and peppermint consistently stand out for their health benefits. People who drink two or more cups of tea per day have a 9% to 13% lower risk of death from any cause compared to non-tea drinkers, based on a large study from the National Cancer Institute. That alone makes tea one of the simplest health habits you can adopt.
Green Tea for Metabolism and Heart Health
Green tea is the most studied tea in the world, and for good reason. A single cup contains about 200 to 300 mg of a powerful antioxidant called EGCG, which makes up more than half of all the beneficial compounds in green tea. At normal drinking levels, EGCG acts as an antioxidant, triggering protective pathways in your cells. It also helps relax blood vessels by reducing production of a compound that constricts them, and it has antithrombotic properties, meaning it helps prevent dangerous blood clots.
Green tea also contains about 25 mg of an amino acid called L-theanine per cup. This is what gives tea its reputation as a “calm focus” drink. L-theanine has a mild calming effect on the brain, and when combined with the caffeine naturally present in tea (about 29 mg per cup of green tea), the two work together. Several studies have found synergistic effects of this pairing on cognition, mood, and attention. You get alertness without the jitteriness that coffee sometimes causes.
Black Tea for Blood Pressure
Black tea is the most popular tea worldwide and carries its own set of benefits. It contains a different class of antioxidants created during the oxidation process that turns green tea leaves dark. A cup of brewed black tea has about 48 mg of caffeine, making it the strongest caffeinated tea option while still coming in well below coffee.
The cardiovascular evidence for black tea is solid. Clinical trials have shown that regular black tea consumption lowers both systolic blood pressure (by about 2.6 mmHg) and diastolic blood pressure (by about 2.2 mmHg). A six-month trial of three cups daily also found reduced blood pressure variability during nighttime, which is an independent marker of cardiovascular risk. Higher tea consumption overall is associated with lower risk of death from cardiovascular disease, ischemic heart disease, and stroke.
Chamomile for Sleep and Relaxation
Chamomile is the go-to herbal tea for winding down. Its active ingredient, apigenin, works on the same calming brain receptors that anti-anxiety medications target, though through a different mechanism. In animal studies, apigenin increases sedation and reduces physical activity, both of which shorten the time it takes to fall asleep.
Human studies using chamomile extract have shown that postnatal women who drank chamomile tea had lower scores for depression symptoms and sleep inefficiency related to physical discomfort. A trial in people with primary insomnia found a trend toward improved daytime functioning after 28 days of chamomile extract, though the results were modest. Chamomile won’t knock you out like a sleep medication, but as a nightly ritual with genuine biological activity behind it, it’s one of the best caffeine-free options before bed.
Peppermint for Digestion
If you deal with bloating, cramping, or an irritable stomach, peppermint tea is worth trying. The key ingredient is menthol, which relaxes the smooth muscle lining your digestive tract by blocking calcium channels in those muscle cells. This is the same mechanism that prescription antispasmodic drugs use, just in a milder, natural form. Peppermint also modulates pain signals in the gut through specific receptors in the intestinal wall, which helps explain why it reduces the visceral discomfort associated with irritable bowel syndrome.
Peppermint tea is naturally caffeine-free, so it works at any time of day. It also has mild antimicrobial and anti-inflammatory properties in the gut.
How to Brew Tea for Maximum Benefit
How you prepare your tea matters more than most people realize. Research on antioxidant extraction across green, oolong, black, and scented teas found that hotter water and longer steeping times pull more beneficial compounds into your cup. Antioxidant yield increased steadily with steeping time up to about two hours, after which those same compounds began to degrade.
You don’t need to steep for two hours. For practical purposes, the instructions on most tea bags recommend 70 to 90°C water and 2 to 10 minutes, which is a reasonable range. But if you’re using loose leaf tea, letting it steep a few minutes longer than you normally would, or using water just off the boil, will give you a more antioxidant-rich cup. The tradeoff is bitterness: longer steeping pulls out more tannins, so find the balance that works for your palate.
One common worry you can let go of: adding milk does not block antioxidant absorption. A study measuring catechin levels in blood after drinking black tea with and without milk found no significant difference. Your body absorbs the same amount either way.
Caffeine Comparison Across Tea Types
Caffeine content varies significantly by tea type, and this matters if you’re sensitive or timing your intake around sleep. Per 8-ounce cup:
- Black tea: about 48 mg
- Green tea: about 29 mg
- Decaf black tea: about 2 mg
- Herbal teas (chamomile, peppermint, rooibos): 0 mg
For comparison, a standard cup of coffee contains roughly 95 mg. Catechins from tea reach peak blood levels one to four hours after drinking and clear your system within 24 hours, so spacing your cups throughout the morning and early afternoon gives you steady benefits without disrupting sleep.
Who Should Be Cautious
Green and black tea contain the highest levels of oxalates among all tea types. One liter of black tea contains about 57.5 mg of oxalate. For healthy people, this poses no meaningful risk. But if you’ve had calcium oxalate kidney stones, it’s a different story. Nearly half of people who form these stones absorb oxalate at higher-than-normal rates from their gut, which means the oxalate in tea has a bigger impact on their stone risk. If you fall into that category, herbal and fruit teas are a safer choice, as their oxalate content is low.
High-dose green tea supplements (as opposed to brewed tea) can also tip EGCG into a range where it acts as a pro-oxidant rather than an antioxidant, potentially causing liver stress. Drinking brewed green tea keeps you well within safe levels. The issue is almost exclusively with concentrated extract capsules.