Several proven strategies increase blood flow, and most of them work through the same core mechanism: boosting your body’s production of nitric oxide, a molecule that relaxes and widens blood vessels. The most effective approaches combine regular movement, specific foods, adequate hydration, and heat exposure. Here’s how each one works and what to do with the information.
Exercise Opens Blood Vessels Long-Term
Physical activity is the single most reliable way to improve circulation. When you exercise, your heart pumps faster and blood moves through your arteries with more force. That increased flow creates friction along the inner walls of your blood vessels, which triggers them to release nitric oxide and relax. Over weeks and months of consistent exercise, your blood vessels actually become better at producing nitric oxide on their own, even at rest. Research published by the American Heart Association confirmed that long-term aerobic exercise improves this vessel-relaxing response in people with normal blood pressure and in those with high blood pressure.
The American Heart Association recommends at least 150 minutes per week of moderate-intensity aerobic activity (brisk walking, cycling, swimming) or 75 minutes of vigorous activity like running. Spreading it across the week matters more than cramming it into one or two days. Hitting 300 minutes per week provides additional benefits. Even short walks after meals improve circulation in the hours that follow.
Foods That Boost Nitric Oxide
Certain foods give your body the raw materials to produce more nitric oxide, directly widening blood vessels and lowering resistance to blood flow.
Beets are the standout. They’re packed with dietary nitrates, which your body converts into nitric oxide. In one study of 38 adults, drinking a beet juice supplement increased nitric oxide levels by 21% within just 45 minutes. Even a small serving of about 3.4 ounces of beet juice significantly raised nitric oxide in both men and women.
Leafy greens like spinach, arugula, kale, and cabbage work through the same nitrate pathway. One 2020 study found that a nitrate-rich meal containing spinach or beet juice equally increased nitrate levels and significantly lowered both the top and bottom numbers of blood pressure readings.
Watermelon takes a different route. It’s rich in citrulline, an amino acid your body converts first to arginine, then to nitric oxide. It’s one of the best natural sources of citrulline available.
Garlic works differently still. Rather than supplying nitrate raw materials, it activates the enzyme responsible for converting arginine into nitric oxide, essentially turning up the dial on a process already happening in your body.
Dark Chocolate and Cocoa Flavanols
Dark chocolate contains plant compounds called flavanols that measurably improve blood flow. In a study published in the Journal of the American Heart Association, patients with peripheral artery disease (a condition where narrowed arteries reduce blood flow to the legs) ate dark chocolate and saw their flow-mediated dilation, a measure of how well arteries expand, jump from 2.3% to 6.3%. That’s nearly a threefold improvement. Their walking ability also improved in the same session. The key is choosing dark chocolate with a high cocoa content, since milk chocolate and heavily processed varieties contain far fewer flavanols.
Omega-3 Fats Make Blood Cells More Flexible
Blood flow isn’t just about how wide your vessels are. It also depends on how easily your red blood cells can squeeze through tiny capillaries. Omega-3 fatty acids from fish oil integrate directly into red blood cell membranes, making them more flexible and fluid. This improved “deformability” helps blood move through the smallest vessels in your fingers, toes, muscles, and organs.
There’s an important dose detail here. Research in the journal Nutrients found that low-dose fish oil supplementation improved red blood cell flexibility, while high doses actually had the opposite effect. At high concentrations, omega-3s made cell membranes more vulnerable to oxidative damage, which stiffened them. Fatty fish like salmon, mackerel, and sardines two to three times per week, or a moderate fish oil supplement, hits the sweet spot.
Hydration Keeps Blood Flowing Freely
When you’re dehydrated, your blood becomes thicker and more viscous. Viscosity measures a fluid’s resistance to flow: think of the difference between water and honey. The thicker your blood, the harder your heart has to work to push it through your vessels, and the more likely it is to form clots. Red blood cells are the biggest factor in blood thickness, accounting for up to half of total blood volume. Staying well-hydrated keeps the fluid portion of your blood at a healthy ratio relative to those cells, reducing the effort required to circulate it.
There’s no magic number for daily water intake that applies to everyone. Your needs depend on body size, activity level, climate, and diet. A practical check: if your urine is pale yellow, your hydration is likely adequate. Dark yellow or amber means your blood is probably thicker than it needs to be.
Heat Exposure and Sauna Use
Heat causes blood vessels near your skin to open wide, dramatically increasing blood flow to your extremities. This is why your skin turns red in a hot bath or sauna. Over time, regular heat exposure may train your blood vessels to dilate more efficiently, similar to what exercise does.
Traditional dry saunas operate between 160 and 200°F, with sessions of 5 to 20 minutes recommended for most people (up to 30 minutes for experienced users who stay well-hydrated). Infrared saunas run cooler, between 110 and 150°F, and sessions typically last 15 to 30 minutes. Both types promote circulation and muscle recovery. A warm bath at home produces a milder version of the same effect. The key is staying hydrated, since sweating in heat can thicken your blood and partially offset the benefit.
Gravity and Body Position
If you spend long hours sitting or standing, blood tends to pool in your lower legs. Simply changing your body’s relationship to gravity can redirect that flow. Yoga inversions, where your heart is positioned above your head, use gravity to move blood from your legs back toward your heart and lungs. Common poses that accomplish this include Legs Up the Wall, Downward-Facing Dog, and supported headstands. Legs Up the Wall is particularly accessible: you lie on your back with your legs resting vertically against a wall for 5 to 15 minutes. This pose can also reduce pain and swelling in the lower limbs by promoting lymphatic drainage.
You don’t need yoga to use this principle. Elevating your feet on a pillow while lying on the couch accomplishes a similar, if less dramatic, effect.
Compression Garments for Leg Circulation
Compression stockings apply graduated pressure to your lower legs, physically squeezing blood upward toward your heart. They come in several pressure levels measured in millimeters of mercury (mmHg):
- Mild (8 to 15 mmHg): light support for minor swelling and tired legs
- Moderate (15 to 20 mmHg): useful for travel, mild varicose veins, and preventing blood clots during long flights
- Firm (20 to 30 mmHg): for moderate swelling, varicose veins, and post-surgical recovery
- Extra firm (30 to 40 mmHg): reserved for severe venous conditions
For general circulation improvement, most people start with mild or moderate compression. The stockings work best when put on first thing in the morning before fluid has a chance to settle in your lower legs.
Supplements: Citrulline and Arginine
L-citrulline supplements provide your body with a precursor to nitric oxide. Your kidneys convert citrulline to arginine, which then becomes nitric oxide. Citrulline is often preferred over direct arginine supplements because it survives digestion better and produces a more sustained rise in blood arginine levels. Doses up to 6 grams per day have been used in studies lasting up to 16 days, though no universally optimal dose has been established for any specific condition.
Watermelon, as noted above, is a natural source of citrulline. If you eat it regularly, you may not need a supplement at all. For people looking at supplements specifically, citrulline is a reasonable option, but it works best alongside the dietary and exercise strategies above rather than as a standalone fix.