Regular exercise, certain foods, and staying well-hydrated are the most effective ways to increase blood flow throughout your body. The underlying mechanism behind most of these strategies is the same: they help your blood vessels relax and widen, reducing resistance so blood moves more freely. Here’s what actually works, how much it matters, and what to watch for if poor circulation is a concern.
How Your Body Controls Blood Flow
Your blood vessels aren’t rigid pipes. They actively expand and contract based on signals from the cells lining their walls. The most important signal is a molecule called nitric oxide, produced by the inner lining of your arteries. When released, nitric oxide drifts into the surrounding muscle layer of the vessel wall, triggering a chain reaction that causes the muscle to relax. The vessel widens, resistance drops, and more blood flows through.
Nearly every strategy for improving circulation works by either boosting nitric oxide production, reducing blood thickness, or physically pushing blood through vessels that tend to pool. Understanding this helps you see why some approaches work and others don’t.
Exercise: The Single Most Effective Strategy
Physical activity increases blood flow both immediately and over time. When you exercise, your heart pumps harder, and faster-moving blood creates a physical force called shear stress against your artery walls. That friction is the strongest natural trigger for nitric oxide release. The more consistently you expose your arteries to this stimulus, the better they get at dilating on demand.
Intensity matters more than you might expect. In a study of young adults performing treadmill exercise, vigorous-intensity sessions (about 70% of maximum effort) increased blood flow to the brain by roughly 268 mL per minute afterward, compared to only 125 mL per minute after light-intensity exercise. The effect was both intensity-dependent and dose-dependent, meaning longer, harder sessions produced bigger gains. That said, even light walking produces measurable improvements, so starting wherever you are still helps.
The American Heart Association recommends at least 150 minutes per week of moderate-intensity aerobic activity, or 75 minutes of vigorous activity, spread across the week. Going beyond 300 minutes per week provides additional cardiovascular benefits. The key is consistency. A single workout temporarily boosts circulation for hours, but repeated sessions over weeks and months cause lasting structural changes in your arteries that make them more responsive.
Foods That Open Blood Vessels
Certain foods supply raw materials your body uses to produce nitric oxide. The two most well-studied are nitrate-rich vegetables and cocoa.
Beets and Leafy Greens
Beets, spinach, arugula, and other nitrate-rich vegetables provide inorganic nitrate that bacteria on your tongue convert into nitrite, which your body then transforms into nitric oxide. This isn’t a subtle effect. In a randomized, placebo-controlled trial published by the American Heart Association, hypertensive patients who consumed beet juice daily for six weeks saw their systolic blood pressure drop by about 8 mmHg compared to placebo. Their endothelial function, a direct measure of how well arteries dilate, improved by approximately 20%. Arterial stiffness also decreased.
These aren’t small numbers. An 8 mmHg drop in systolic pressure is comparable to what some medications achieve. If you’re looking for a single dietary change to support circulation, adding a daily serving of beets or dark leafy greens is one of the most evidence-backed options.
Cocoa and Dark Chocolate
Cocoa contains compounds called flavanols that directly stimulate nitric oxide production in artery walls. A meta-analysis of randomized trials found that cocoa flavanols improved artery dilation by an average of 1.17%, with the optimal dose around 710 mg of total flavanols. That’s roughly equivalent to a tablespoon of natural cocoa powder or a small serving of high-percentage dark chocolate. Heavily processed “Dutch process” cocoa and milk chocolate contain far fewer flavanols, so the source matters.
Hydration and Blood Thickness
Your blood’s ability to flow depends partly on how thick it is. Blood viscosity is governed largely by hematocrit, the proportion of red blood cells to total blood volume. When you’re dehydrated, plasma volume drops, hematocrit rises, and blood becomes thicker. A single-unit increase in hematocrit can raise blood viscosity by about 4%. According to Poiseuille’s Law, any increase in viscosity directly increases the resistance blood encounters as it moves through your vessels.
You don’t need to overhydrate. Simply maintaining steady fluid intake throughout the day, especially before and after exercise or in hot weather, keeps your blood at a viscosity that flows efficiently. If your urine is pale yellow, you’re generally in a good range.
Supplements: Citrulline vs. Arginine
Since nitric oxide is made from the amino acid arginine, both arginine and citrulline supplements are marketed for circulation. Citrulline is the clear winner. When you take arginine by mouth, about 70% of it gets broken down by your gut and liver before reaching your bloodstream. Only around 31% makes it into general circulation. Citrulline, on the other hand, bypasses that breakdown almost entirely, with close to 100% reaching the bloodstream, where your kidneys convert it into arginine.
In direct comparisons, citrulline supplementation raised plasma arginine levels 35% more than equivalent arginine supplementation and produced a greater increase in nitric oxide production. If you’re considering a supplement specifically for blood flow support, citrulline is the more efficient choice. It’s commonly found in watermelon, though supplements provide much higher doses than you’d get from food.
Compression Garments for Leg Circulation
If your blood flow concerns center on your legs, particularly swelling, varicose veins, or heaviness after sitting for long periods, graduated compression stockings can mechanically assist venous return. These garments apply the most pressure at the ankle and gradually decrease pressure moving up the leg, pushing pooled blood back toward the heart.
Compression levels are measured in millimeters of mercury (mmHg). Low compression (under 20 mmHg) is available over the counter and suitable for mild swelling or long flights. Medium compression (20 to 30 mmHg) addresses moderate symptoms and is often recommended for frequent travelers or people who stand all day. High compression (30 to 40 mmHg) is used for more significant venous conditions and has the strongest evidence for healing venous ulcers and preventing recurrence. In general, the highest level of compression you can comfortably tolerate will be the most beneficial.
What About Saunas and Heat Therapy?
Saunas and hot baths are often promoted as circulation boosters. Heat does cause blood vessels to dilate acutely, and the logic seems sound. However, a systematic review and meta-analysis of 20 randomized controlled trials testing passive heating interventions (hot water bathing, saunas, hot yoga, local heating) over periods of 2 to 15 weeks found no significant improvements in most vascular health markers, including artery dilation capacity and arterial stiffness. While a hot bath feels good and temporarily increases skin blood flow, the evidence doesn’t support it as a reliable long-term strategy for improving circulation.
Signs of Poor Circulation Worth Noting
Most people searching for ways to improve blood flow are dealing with cold hands and feet, leg fatigue, or general sluggishness. These are common and often respond well to the strategies above. But persistent symptoms like leg pain while walking that stops when you rest, wounds on your feet that heal slowly, or skin color changes in your lower legs can indicate peripheral artery disease, a narrowing of the arteries that supply your limbs.
Peripheral artery disease is typically screened using a simple test that compares blood pressure at your ankle to blood pressure in your arm. A ratio below 0.90 is widely accepted as indicating the condition, with values between 0.91 and 0.99 considered borderline. Values of 0.41 to 0.90 suggest mild to moderate disease, and anything below 0.40 points to severe narrowing. If you have risk factors like smoking, diabetes, or high blood pressure and notice these symptoms, a screening test is quick and noninvasive.