Caffeinated black tea is the most accessible and well-supported option for raising low blood pressure in the short term. An 8-ounce cup contains about 48 mg of caffeine, enough to produce a noticeable bump in blood pressure within 30 minutes. Beyond caffeinated teas, licorice root tea and ginseng tea both have blood-pressure-raising properties through different mechanisms, making them worth considering depending on your situation.
How Caffeinated Tea Raises Blood Pressure
Caffeine appears to raise blood pressure in two ways. It may block a hormone that keeps your arteries relaxed and widened, causing them to narrow slightly. It also stimulates your adrenal glands to release more adrenaline, which directly increases blood pressure. These effects kick in within about 30 minutes of drinking tea and tend to fade within an hour or so.
Black tea delivers the most caffeine per cup at roughly 48 mg per 8 ounces. Green tea comes in lower at about 29 mg per cup. Both will produce some effect, but if your goal is specifically to raise low blood pressure, black tea gives you more to work with. For context, a cup of brewed coffee typically has double or triple that amount, so tea offers a gentler, more controlled lift.
In one case report published in the Iranian Red Crescent Medical Journal, a patient with severe low-pressure headaches was treated with about 200 cc (roughly 7 ounces) of tea every two hours during the day. Her symptoms improved significantly within 48 hours. The combination of hydration and caffeine made tea effective as a first-line conservative treatment. While that’s an extreme protocol for a clinical setting, it illustrates how regular tea consumption throughout the day can meaningfully support blood pressure.
Licorice Root Tea: The Strongest Herbal Option
Licorice root tea is the most potent herbal tea for raising blood pressure, and it works through an entirely different pathway than caffeine. The active compound, glycyrrhizin, interferes with an enzyme in your kidneys that normally keeps cortisol in check. When that enzyme is blocked, cortisol floods receptors that control sodium and water balance, causing your body to retain more sodium and water. The result is increased blood volume and higher blood pressure.
This is a genuinely powerful effect. Published case reports in BMJ Case Reports have documented licorice tea causing full-blown hypertension in people who drank it heavily, sometimes within a month of daily use. That potency is exactly what makes it potentially useful for low blood pressure, but it also means you need to be careful with how much you drink.
Safe Limits for Licorice Tea
The European Union’s Scientific Committee on Food set an upper limit of 100 mg of glycyrrhizin per day, which corresponds to roughly 60 to 70 grams of licorice. A more conservative estimate from Walker and Edwards suggests that 1 to 5 grams of licorice daily (containing 1 to 10 mg of glycyrrhizin) is safe for most healthy adults. Most commercial licorice root tea bags fall somewhere in this lower range, so one to two cups per day is a reasonable starting point.
The risks of overdoing it are real. Excessive licorice consumption depletes potassium, which can cause muscle weakness, heart rhythm problems, and dangerously high blood pressure. These effects take a long time to reverse because the active compounds have a long half-life in your body, and it can take up to six months for your hormone balance to fully normalize after stopping. Older adults are more susceptible because the kidney enzyme that glycyrrhizin targets already functions less efficiently with age. If you take diuretics, those medications can amplify the potassium-lowering effect, making the combination particularly risky.
Ginseng Tea as an Adaptogen
Ginseng tea, specifically made from Panax ginseng (sometimes called Korean ginseng), has an interesting property: it tends to normalize blood pressure in whichever direction it needs to go. Research published in the Journal of Ginseng Research describes this as an “adaptogen” effect. When blood pressure is low, ginseng generally raises it toward normal. When blood pressure is high, it can help lower it. This makes ginseng a reasonable choice if your blood pressure fluctuates or if you’re unsure whether a strong blood-pressure-raising tea like licorice is appropriate.
The traditional Korean use of ginseng root tea centers on restoring energy and physical vitality, which aligns with the fatigue and sluggishness that often accompany low blood pressure. Ginseng tea bags are widely available, or you can steep sliced ginseng root in hot water for 5 to 10 minutes. The effect is milder than licorice and works best as part of a daily routine rather than a quick fix.
Which Tea to Choose for Your Situation
If you need a quick pick-me-up when you feel lightheaded or sluggish, black tea is your best bet. The caffeine works fast, peaks within 30 minutes, and the hydration itself helps support blood volume. Drinking it with a meal or a salty snack amplifies the effect, since sodium also helps retain fluid and raise blood pressure.
If your blood pressure runs consistently low and you want something to incorporate into a daily routine, licorice root tea is the most effective herbal option. Start with one cup per day and pay attention to how you feel over the first week or two. Keep your intake well below the 100 mg glycyrrhizin daily ceiling, and take breaks from it rather than drinking it continuously for months.
If you’re looking for something gentler and more balanced, ginseng tea offers a moderate, normalizing effect without the potassium risks of licorice. It’s a good option for people who want mild, sustained support.
You can also combine approaches. A cup of black tea in the morning for the caffeine boost, and a cup of licorice or ginseng tea later in the day, covers both the immediate and longer-term aspects of managing low blood pressure. Just keep total licorice consumption moderate and consistent rather than heavy and sporadic.
Teas That Won’t Help (or May Lower Blood Pressure)
Not all herbal teas are neutral. Hibiscus tea has been shown in multiple studies to lower blood pressure, so it’s one to avoid if yours is already low. Chamomile tea has mild blood-pressure-lowering properties as well. Peppermint tea is generally neutral but won’t raise blood pressure. If you’re choosing herbal teas specifically to address hypotension, stick with licorice root or ginseng rather than reaching for whatever is in the cupboard.
Decaffeinated black or green tea loses the caffeine-driven blood pressure effect almost entirely, so if that’s your goal, regular (caffeinated) versions are the ones to buy.