Cinnamon can modestly lower blood pressure, with the best evidence pointing to 500 mg to 1,500 mg daily for at least 12 weeks. A 2024 umbrella review of multiple meta-analyses found that cinnamon supplementation reduced systolic blood pressure by about 2.4 mmHg and diastolic by about 1.7 mmHg on average. That’s a meaningful nudge in the right direction, though it won’t replace medication for most people with hypertension. Getting the benefit safely depends on choosing the right type, the right dose, and the right form.
How Cinnamon Affects Blood Pressure
The main active compound in cinnamon, cinnamaldehyde, relaxes blood vessel walls by reducing calcium activity in the smooth muscle that lines your arteries. When those muscles relax, your vessels widen and blood flows with less resistance. Animal research also suggests a nitric oxide-dependent pathway, meaning cinnamon may help your blood vessels produce more of the signaling molecule that tells them to dilate. This is the same mechanism behind several conventional blood pressure medications.
Cinnamon also improves blood sugar regulation and insulin sensitivity, which matters because high blood sugar and insulin resistance both stiffen blood vessels over time. In a 16-week trial of people with metabolic syndrome, 3 grams of cinnamon daily improved fasting blood sugar, cholesterol, triglycerides, and blood pressure together. So for people whose high blood pressure is tangled up with blood sugar problems or metabolic syndrome, cinnamon may address multiple issues at once.
Effective Dose and Duration
Human trials have used a wide range of doses, from 500 mg to 3 grams per day. A pooled analysis of randomized trials found that doses below 2 grams per day actually had greater effects on systolic blood pressure than higher doses. The sweet spot in most successful trials falls between 500 mg and 1,500 mg daily.
Duration matters as much as dose. Trials lasting at least 12 weeks consistently show better results than shorter ones. In one 90-day trial, participants taking 1,500 mg daily in capsule form saw significant drops in daytime systolic blood pressure compared to placebo. A separate 12-week study using just 500 mg of a water-soluble cinnamon extract reduced systolic pressure from 133 to 128 mmHg, a 3.8% decrease that pushed participants from an elevated range back toward normal.
The research also suggests age plays a role: participants younger than 50 saw larger reductions in systolic pressure than older adults.
Capsules, Powder, or Extract
Most clinical trials used cinnamon in capsule form, either as ground cinnamon powder or a standardized water-soluble extract. Both have shown results. The extract form concentrates the active compounds while leaving behind much of the coumarin (a potentially harmful substance discussed below), which makes it a practical choice if you plan to supplement long-term.
Ground cinnamon sprinkled on food is fine for culinary amounts, but hitting a therapeutic dose of 1,000 to 1,500 mg daily through food alone means consuming roughly half a teaspoon to a full teaspoon every day, consistently for months. Capsules make this easier to measure and maintain. If you prefer powder, mixing it into oatmeal, smoothies, or coffee works, but keep in mind that the type of cinnamon you choose has real safety implications.
Ceylon vs. Cassia: A Safety Decision
This is the single most important choice when supplementing cinnamon at therapeutic doses. The two main varieties sold everywhere are cassia cinnamon (the cheap, common kind) and Ceylon cinnamon (sometimes labeled “true cinnamon”). Cassia contains roughly 1% coumarin. Ceylon contains about 0.004%, making it 250 times lower in coumarin.
Coumarin is a natural compound that can damage the liver at high intake levels. The European Food Safety Authority set the tolerable daily intake at 0.1 mg per kilogram of body weight. For a 150-pound person, that ceiling is about 7 mg of coumarin per day. Just one to two teaspoons of cassia cinnamon can exceed that limit. If you’re taking 1,500 mg of cassia daily for blood pressure, you’re getting around 15 mg of coumarin, more than double the safe threshold.
Ceylon cinnamon, by contrast, delivers negligible coumarin even at high supplemental doses. If you plan to take cinnamon daily for 12 weeks or longer, Ceylon is the only variety that makes sense. Look for supplements that specifically state “Ceylon” or “Cinnamomum verum” on the label.
Risks and Drug Interactions
The coumarin in cassia cinnamon doesn’t just stress the liver on its own. It can interact dangerously with blood-thinning medications. Coumarin is the chemical ancestor of warfarin, and it inhibits vitamin K to prevent blood clotting. A published case report documented fatal gastrointestinal bleeding when a patient combined cinnamon and ginger supplements with a direct-acting oral anticoagulant. The cinnamon essentially added a second anticoagulant on top of the prescribed one, dramatically increasing bleeding risk.
If you take warfarin, dabigatran, rivaroxaban, or any other anticoagulant, do not add cinnamon supplements without medical guidance. The same caution applies to antiplatelet drugs and anyone scheduled for surgery.
Liver toxicity is the other concern at high doses. In one case report, a 73-year-old woman developed acute hepatitis within a week of starting cinnamon supplements while also taking a statin (another class of medication that can strain the liver). Her symptoms included abdominal pain, vomiting, and diarrhea. If you take any medication processed by the liver, including statins, the combination with high-dose cassia cinnamon raises your risk.
A Practical Approach
Based on the available trial data, here’s what a reasonable cinnamon routine for blood pressure looks like:
- Type: Ceylon cinnamon, to keep coumarin intake negligible
- Dose: 500 mg to 1,500 mg per day, split into two or three doses with meals
- Form: Capsules (powder or water-soluble extract) for consistent dosing
- Duration: At least 12 weeks before evaluating results
- Monitoring: Track your blood pressure at home to see whether it’s actually working for you
The expected benefit is modest: roughly a 2 to 5 mmHg drop in systolic pressure. That’s comparable to the effect of cutting sodium intake or adding regular walking. It’s a useful addition to other lifestyle changes, not a standalone treatment for hypertension. People with prediabetes or metabolic syndrome may see the most benefit, since cinnamon improves blood sugar and cholesterol alongside blood pressure in that population.