Several common kitchen spices can meaningfully lower blood pressure, with garlic showing the strongest clinical evidence. A meta-analysis of 20 trials found garlic reduced systolic blood pressure by an average of 5.1 mmHg and diastolic by 2.5 mmHg compared to placebo. That may sound modest, but in people who already have high blood pressure, the effect was nearly doubled: 8.7 mmHg systolic and 6.1 mmHg diastolic.
No single spice replaces medication for serious hypertension, but regularly incorporating certain spices into your cooking can contribute to better blood pressure over time, especially when paired with other lifestyle changes like reducing sodium.
Garlic
Garlic has the deepest body of clinical research behind it. The meta-analysis published in The Journal of Nutrition pooled data from 970 participants across 20 randomized trials and confirmed statistically significant reductions in both systolic and diastolic pressure. The effect was most pronounced in people whose blood pressure started at or above 140/90 mmHg, the threshold for hypertension. For those individuals, garlic supplementation dropped systolic pressure by 8.7 mmHg on average.
Garlic works partly because its sulfur compounds promote the production of nitric oxide, a molecule that relaxes blood vessel walls and improves blood flow. Cooking garlic reduces some of this activity, so letting crushed garlic sit for about 10 minutes before heating it helps preserve the beneficial compounds. Most studies used aged garlic extract in supplement form, but regularly eating fresh garlic still contributes.
Ginger
Ginger lowers blood pressure through a mechanism similar to a common class of blood pressure medications: it blocks voltage-dependent calcium channels in blood vessel walls. When calcium flows into the smooth muscle cells lining your arteries, those muscles contract and your blood pressure rises. Ginger’s active compounds interfere with that process, allowing vessels to relax and widen. Animal studies have shown ginger produces blood vessel relaxation comparable to the calcium channel blocker verapamil.
Human evidence is still growing, but ginger is easy to add to stir-fries, soups, teas, and marinades. Fresh ginger tends to contain higher concentrations of gingerol, the primary active compound, compared to dried powder.
Cinnamon
Cinnamon has been studied in doses ranging from 500 to 10,000 mg per day for its effects on blood pressure. Clinical trials have shown reductions in both systolic and diastolic readings, though results vary depending on the dose, the type of cinnamon, and whether participants had diabetes or metabolic syndrome (conditions where cinnamon tends to show stronger effects).
There are two main types of cinnamon on the market, and the distinction matters. Cassia cinnamon, the cheaper and more common variety found in most grocery stores, contains higher levels of coumarin, a natural compound that can stress the liver in large amounts. Ceylon cinnamon has significantly less coumarin and is the safer choice if you plan to use cinnamon daily or in larger quantities. For typical culinary use (a teaspoon or less per day in oatmeal, smoothies, or coffee), either variety is generally fine.
Cardamom
Cardamom appears to lower blood pressure by enhancing fibrinolysis, your body’s process for breaking down blood clots, and by stimulating the parasympathetic nervous system (the “rest and digest” side of your nervous system that naturally slows heart rate and relaxes blood vessels). It has been studied in people with type 2 diabetes, where it showed a favorable effect on vascular function.
Cardamom pairs well with coffee, chai, rice dishes, and baked goods. Green cardamom is the variety most commonly used in both cooking and clinical research.
Oregano
Oregano contains carvacrol, a compound that acts as a blood vessel dilator. It opens blood vessels to improve blood flow from the heart to the rest of the body, which helps maintain healthy pressure levels. While most of the evidence on carvacrol comes from laboratory and animal studies rather than large human trials, oregano is one of the easiest spices to use generously in everyday cooking. It works well in tomato sauces, salad dressings, roasted vegetables, and grain bowls.
Using Spices to Replace Salt
Beyond their direct effects on blood vessels, spices offer an indirect benefit that may be just as important: they make food taste good without sodium. The average American consumes roughly 3,400 mg of sodium per day, well above the recommended limit of 2,300 mg. Excess sodium raises blood pressure by causing your body to retain water, increasing the volume of blood your heart has to pump.
The American Heart Association recommends flavoring food with herbs and spices instead of salt, but warns against packaged seasoning mixes, which often contain significant amounts of sodium. Check the nutrition label on any pre-made blend. Individual dried spices, or blends you mix yourself, are a reliable alternative. A combination of garlic powder, oregano, black pepper, and a pinch of cinnamon can season most savory dishes without any added salt.
Safety at Higher Doses
Used in normal cooking amounts, these spices are safe for the vast majority of people. The concerns arise when spices are taken in concentrated supplement form, particularly if you’re on certain medications.
- Garlic and ginger both have blood-thinning properties. Taken regularly in concentrated or supplemental doses, they can increase bleeding risk if you’re also on anticoagulant medications.
- Turmeric (often discussed alongside these spices) can amplify the effects of blood pressure medications, blood thinners, and diabetes drugs. It is also not recommended for people with gallstones or bleeding disorders.
- Cassia cinnamon in high doses can increase bleeding risk when combined with anticoagulants, and its coumarin content can affect the liver over time.
If you take blood pressure medication, blood thinners, or diabetes drugs, the culinary amounts you sprinkle into a meal are unlikely to cause problems. Concentrated supplements are a different story and worth discussing with whoever manages your prescriptions, because the blood-pressure-lowering effect of the spice can stack on top of the medication’s effect and push your pressure too low.