A high red blood cell count can often be brought down through lifestyle changes, though the right approach depends on why your levels are elevated in the first place. Normal ranges fall between 4.35 and 5.65 million cells per microliter for men, and 3.92 to 5.13 million for women. If your numbers sit above those thresholds, several natural strategies can help bring them closer to normal.
Find Out Why Your Count Is High
Before trying to lower your red blood cell count, it helps to understand what’s driving it up. Your body produces more red blood cells in response to specific signals, and the most common triggers include dehydration (which concentrates existing cells rather than creating new ones), chronic low oxygen levels from smoking or lung conditions, living at high altitude, and testosterone therapy. Less commonly, a bone marrow disorder called polycythemia vera causes overproduction regardless of oxygen levels.
The distinction matters because some causes respond well to lifestyle changes while others need medical treatment. Dehydration, smoking, and fitness level are all modifiable. A myeloproliferative disorder is not something you can manage with diet alone. If your doctor has already identified the cause, you can target your efforts more effectively.
Stay Well Hydrated
Dehydration is one of the most common and overlooked reasons for an elevated red blood cell count. When your blood plasma volume drops, the concentration of red blood cells per microliter rises even though your body hasn’t made any extra cells. This is called relative erythrocytosis, and it can make lab results look worse than the underlying reality.
Consistently drinking enough water throughout the day expands your plasma volume and dilutes the concentration of red blood cells. There’s no magic number that works for everyone, but aiming for pale yellow urine is a reliable indicator that you’re adequately hydrated. If your elevated count turns out to be driven primarily by low plasma volume, rehydration alone can normalize your results surprisingly fast.
Start Regular Aerobic Exercise
Endurance exercise is one of the most effective natural ways to lower the concentration of red blood cells in your blood, and it works through a specific mechanism: plasma volume expansion. When you begin a regular aerobic training program, your blood plasma volume increases rapidly over just a few days, while red blood cell mass takes weeks to months to catch up. The net effect is that your blood becomes more dilute, lowering your hematocrit (the percentage of blood volume occupied by red cells).
Over several months of consistent training, total blood volume expands roughly 10% to 20% above your pre-training baseline. Highly trained endurance athletes carry blood volumes 20% to 25% larger than untrained individuals, regardless of age or sex. That expanded plasma volume is the reason endurance athletes often have lower hematocrit readings despite having more total red blood cells. For someone with a mildly elevated count, regular jogging, cycling, or swimming can meaningfully shift the balance.
Quit Smoking
Smoking raises red blood cell production through a straightforward pathway. Carbon monoxide from cigarette smoke binds to hemoglobin far more readily than oxygen does, reducing how much oxygen each red blood cell can carry. Your body interprets this as an oxygen shortage and responds by ramping up red blood cell production to compensate.
When you stop smoking, carbon monoxide clears from your bloodstream within hours, and your hemoglobin gradually returns to carrying oxygen at full capacity. As your body senses adequate oxygen delivery again, it dials back the signal to produce extra red blood cells. Since each red blood cell has a lifespan of about 120 days, with roughly 0.8% of your total supply being destroyed and replaced daily, your count will drift downward over weeks to months as old cells die off and fewer replacements are made. The heavier the smoking habit, the more dramatic the improvement tends to be.
Move to a Lower Altitude
Living above about 5,000 feet triggers your body to make more red blood cells to compensate for thinner air. If you relocate to a lower elevation, the reverse happens quickly. Your body has a dedicated cleanup process called neocytolysis that selectively destroys the youngest red blood cells when it detects that oxygen levels have improved and the extra cells are no longer needed.
Research on people descending from high altitude shows that red blood cell mass can drop by 9% within just three to seven days of reaching sea level. After expeditions to extreme altitudes like the Himalayas, polycythemia (abnormally high red blood cell levels) has been fully reversed within one week of descent. Even if relocating isn’t practical, spending extended periods at lower elevations can give your body the signal to scale back production.
Adjust Your Iron Intake
Iron is a core building block of hemoglobin, the oxygen-carrying protein packed inside every red blood cell. Your body needs about 20 milligrams of iron daily just for hemoglobin turnover, plus another 5 milligrams for other metabolic processes. When iron is abundant, your bone marrow has everything it needs to produce red blood cells at full speed. When iron is limited, production naturally slows.
If your red blood cell count is elevated, reducing iron-rich foods can gently tap the brakes on new cell production. The biggest dietary sources of highly absorbable iron include red meat, organ meats, and dark poultry meat. Plant-based iron from spinach, lentils, and beans is absorbed less efficiently, so shifting toward a more plant-heavy diet effectively reduces how much iron your body takes in. You can also reduce iron absorption by drinking tea or coffee with meals, since the tannins and polyphenols in these beverages bind to iron in the gut.
A word of caution: deliberately restricting iron too aggressively can tip you into iron deficiency anemia, which brings its own set of problems including fatigue, weakness, and impaired immune function. The goal is moderation, not elimination. If you’re working to lower a high count, periodic blood work helps you track whether you’ve found the right balance.
Limit Alcohol Consumption
Alcohol has a complex relationship with blood cell production. Chronic heavy drinking suppresses overall bone marrow function, which can reduce the production of all blood cell types. But this is not a recommended strategy. The damage extends well beyond red blood cells: chronic alcohol exposure causes DNA damage in blood-forming stem cells, drives inflammation, and biases the bone marrow toward producing inflammatory immune cells at the expense of healthy blood cell development. These effects worsen with age, making the combination of heavy drinking and aging particularly harmful to the blood system.
Moderate alcohol intake is unlikely to meaningfully lower your red blood cell count, and heavy drinking creates far more health problems than it solves. If you currently drink heavily and have a high red blood cell count, reducing your intake is wise for dozens of reasons, but don’t view alcohol as a tool for managing your blood counts.
Why Blood Donation Isn’t the Answer
Many people with elevated red blood cell counts assume they can simply donate blood regularly to keep levels in check. Blood transfusion guidelines explicitly state that blood donation should not be used to prevent or treat polycythemia. If you have a known elevated count or high hemoglobin, blood banks will actually defer you and advise you to see your doctor instead.
The clinical alternative is therapeutic phlebotomy, which looks similar to blood donation but is performed under medical supervision specifically to reduce red blood cell volume. The key difference is that therapeutic phlebotomy is prescribed and monitored, with the frequency and volume tailored to your specific levels. If your doctor determines you need phlebotomy, the removed blood is typically discarded rather than used for transfusion, since the underlying condition may affect blood quality.
Putting It All Together
The most effective natural approach combines several of these strategies. Staying well hydrated addresses the most common cause of falsely elevated readings. Regular aerobic exercise expands plasma volume within days and continues improving over months. Quitting smoking removes one of the strongest artificial drivers of red blood cell overproduction. And moderating iron intake gently slows the rate at which your bone marrow produces new cells, allowing the natural 120-day lifespan of existing cells to gradually bring your count down.
How quickly you’ll see results depends on the cause and severity. Hydration can shift your numbers within a day. Exercise-driven plasma expansion begins in the first week. Smoking cessation and dietary changes take longer, since your body needs time to stop replacing old red blood cells at the previous elevated rate. Most people following these strategies consistently should see meaningful improvement within one to three months on follow-up blood work.