The most effective ways to improve circulation are regular exercise, a diet rich in nitrate-containing vegetables, and simple habits like wearing compression socks or alternating water temperatures. Most of these work by helping blood vessels relax and widen, a process driven by nitric oxide, a molecule your blood vessel walls produce naturally. Here’s what actually moves the needle.
How Your Body Controls Blood Flow
The inner lining of every blood vessel produces nitric oxide, a signaling molecule that tells the surrounding muscle to relax. When that muscle relaxes, the vessel opens wider and blood flows more freely. Your body makes nitric oxide from the amino acid L-arginine, and the process ramps up in response to two main triggers: physical forces like the shear of blood moving across the vessel wall, and chemical signals from compounds like acetylcholine. Almost everything that “helps with circulation” ultimately works by increasing nitric oxide availability, reducing vessel stiffness, or both.
Exercise Has the Strongest Evidence
Physical activity is the single most reliable way to improve circulation. When your heart rate rises, blood moves faster through your vessels, creating more shear stress on the vessel walls. That mechanical force stimulates nitric oxide production in real time and, over weeks of consistent training, makes your vessels more responsive at rest too.
Current guidelines recommend 150 to 300 minutes per week of moderate-intensity aerobic exercise (brisk walking, cycling, swimming) or 75 to 150 minutes of vigorous-intensity exercise (running, rowing, high-intensity interval training). Moderate intensity means activities that noticeably raise your heart rate and breathing but still allow conversation. Vigorous intensity means you can only say a few words before needing a breath.
Resistance training matters too. Lifting weights or doing bodyweight exercises at least two days per week, targeting all major muscle groups, supports cardiovascular health alongside aerobic work. The combination of both types is more protective than either alone. If you’re starting from zero, even light walking produces measurable improvements compared to sitting, and you can build from there.
Nitrate-Rich Foods Widen Blood Vessels
Your body can also produce nitric oxide through a dietary shortcut. When you eat vegetables high in natural nitrates, bacteria on your tongue convert those nitrates into nitrites, which then become nitric oxide in your bloodstream. Beetroot juice is the most studied source, but spinach, arugula, watercress, lettuce, celery, and radishes all contain high concentrations (over 250 mg of nitrate per 100 grams of fresh weight).
After drinking beetroot juice, plasma nitrate levels spike roughly 550% within one to two hours, and nitrite levels rise about 400% within two to three hours. The blood flow effects are strongest in the first three hours but can persist up to 24 hours after a single dose. Studies on people with high blood pressure found that consuming beetroot juice daily for two weeks produced better results than shorter one-week interventions, suggesting that consistency matters more than any single serving.
You don’t need a supplement to get these benefits. A large salad with spinach, arugula, and beets, or a glass of beetroot juice a few times a week, delivers meaningful amounts. Avoid mouthwash right before or after eating these foods, since antibacterial rinses kill the tongue bacteria responsible for the nitrate-to-nitrite conversion.
Compression Socks and Stockings
Compression garments work mechanically. They apply graduated pressure, tightest at the ankle and decreasing up the leg, which pushes blood upward against gravity and back toward the heart. This is especially useful if you stand or sit for long periods, travel frequently, or notice swelling in your lower legs.
Compression levels are measured in millimeters of mercury (mmHg). Here’s what each range is typically used for:
- Under 15 mmHg: Light support for tired, achy legs. Available over the counter as “flight socks” or everyday support hosiery.
- 15 to 20 mmHg: Mild therapeutic compression. A meta-analysis of 11 trials found this range effectively reduces leg swelling and symptoms compared to no compression or very low compression (under 10 mmHg).
- 20 to 30 mmHg: Medium compression, often recommended for varicose veins, post-surgical recovery, or long-haul flights. One study of airline passengers over age 50 found this level significantly reduced deep vein clot risk on flights lasting more than eight hours.
- 30 to 40 mmHg and above: High compression for venous ulcers, severe varicose veins, or lymphedema. These are more effective for healing and preventing recurrence but usually require a fitting or prescription.
For general circulation support, 15 to 20 mmHg is a good starting point. The same meta-analysis found no significant additional benefit from jumping straight to higher compression for mild symptoms.
Temperature and Water Therapy
Warm water reliably increases blood flow to the limbs. In controlled studies, immersing the lower legs in water at about 40°C (104°F) for 20 minutes produced significant increases in arterial blood flow compared to both room-temperature control conditions and contrast therapy (alternating hot and cold). The heat causes local blood vessels to dilate, pulling more blood into the area.
Cold water immersion (around 13°C or 55°F) did not significantly decrease blood flow below baseline in the same study, which means a cold plunge won’t necessarily “restrict and then release” circulation the way it’s sometimes marketed. Contrast therapy, alternating between warm and cold, is popular in athletic recovery but didn’t outperform plain warm water for circulation in this research. If your goal is simply to get more blood moving through your legs, a warm bath or foot soak is a straightforward option.
Supplements: L-Arginine and L-Citrulline
Since nitric oxide is made from L-arginine, supplementing with it seems logical. L-citrulline is an alternative that your kidneys convert into L-arginine, and it’s often better absorbed. A dose of 0.75 grams of L-citrulline taken twice daily raised blood arginine levels to the same degree as 1.6 grams of slow-release L-arginine taken twice daily or 1 gram of immediate-release L-arginine three times daily.
The catch: clinical trials have not consistently shown that these supplements improve flow-mediated dilation, the standard measure of how well blood vessels respond to increased blood flow. Researchers have suggested this may be due to short study durations, but the current evidence is not strong enough to recommend supplements over diet and exercise. If you already eat plenty of nitrate-rich vegetables and exercise regularly, adding L-arginine or L-citrulline on top is unlikely to produce dramatic changes.
What Hydration Actually Does (and Doesn’t Do)
You’ll often see advice to “drink more water” to improve circulation, usually with the explanation that dehydration thickens your blood and slows flow. A controlled trial tested this directly by having participants increase their water intake substantially (enough to boost urine output by about 870 mL per day) over several weeks. Blood viscosity did not change. Neither did fibrinogen, blood lipids, glucose, insulin, or any other cardiovascular risk marker. The researchers concluded that the commonly assumed link between extra fluid intake and thinner, faster-flowing blood simply doesn’t hold up.
This doesn’t mean hydration is irrelevant to health. Severe dehydration absolutely impairs cardiovascular function. But if you’re already drinking a normal amount of fluid daily, forcing extra glasses of water won’t meaningfully change how your blood flows.
Signs Your Circulation May Need Attention
Poor circulation often shows up as cold hands or feet, numbness or tingling in the extremities, slow-healing wounds on the legs or feet, skin color changes, or leg cramps during walking that ease when you stop. One objective screening tool is the ankle-brachial index (ABI), which compares blood pressure at your ankle to blood pressure in your arm. A normal ABI falls between 0.9 and 1.4. A reading below 0.9 suggests narrowing of the arteries supplying the legs, a condition called peripheral artery disease. A reading above 1.4 can indicate stiff, calcified arteries, which is common in people with diabetes or kidney disease.
If you notice persistent symptoms, especially wounds that won’t heal or pain while walking short distances, an ABI test is a quick, noninvasive way to get a clearer picture of what’s happening. It takes about 10 minutes in a clinic and requires no preparation.