What foods act like blood thinners?

Certain foods and supplements may have anticoagulant or “blood-thinning” properties similar to prescription anticoagulants like warfarin or heparin. Consuming these foods regularly, especially in large amounts, could potentially thin your blood too much and increase your risk of bleeding.

Do natural blood thinners really work?

While many foods and supplements are claimed to have blood-thinning effects, the evidence is often limited. Most have not been well studied for their anticoagulant effects in humans. Nonetheless, some foods do seem to impact coagulation and may interact with anticoagulant medications. It’s reasonable to moderate consumption of foods with substantial research behind their anticoagulant effects if you are taking blood thinners.

Foods that may act as natural blood thinners

The foods with the most evidence behind their anticoagulant effects include:

  • Garlic
  • Ginger
  • Ginkgo biloba
  • Turmeric/curcumin
  • Omega-3 fatty acids
  • Alcohol
  • Green tea
  • Dark chocolate

Other foods claimed to have blood-thinning effects, but with more limited evidence, include:

  • Grapefruit
  • Onions
  • Cayenne pepper
  • Papaya
  • Wintergreen
  • Dong quai
  • Feverfew

How do they thin your blood?

These foods and supplements may thin your blood through different mechanisms, such as:

  • Inhibiting platelet aggregation – Preventing platelets from clumping together to form clots. This is thought to be a property of garlic, ginger, ginkgo biloba, turmeric, and omega-3s.
  • Increasing fibrinolysis – Breaking down clots by dissolving the protein fibrin. Ginger and ginkgo are believed to have fibrinolytic effects.
  • Reducing blood viscosity – Making the blood less “sticky” and less likely to clot. This may be an effect of alcohol and garlic.
  • Altering prostaglandin synthesis – Prostaglandins are lipid compounds involved in clot formation. Garlic, ginger, ginkgo, turmeric, and omega-3s may alter their synthesis.
  • Inhibiting vitamin K – Vitamin K is essential for proper blood coagulation. Green tea and papaya contain vitamin K-inhibiting compounds.

Do they really thin your blood significantly?

While the anticoagulant mechanisms of these natural products are interesting, the real question is whether consuming them substantially thins your blood in a clinically significant way.

Evidence from clinical studies is limited. However, some major reviews have concluded:

  • Garlic extracts may modestly inhibit platelet aggregation. But the effect in most studies has been minor.
  • Ginger also seems to inhibit platelet aggregation slightly. But evidence is limited.
  • Turmeric and omega-3s have mixed evidence for platelet effects. Any effect appears to be minor.
  • Alcohol has a dose-dependent effect and may impact coagulation at high intakes.
  • For ginkgo, green tea, and other foods, evidence is lacking to support a significant anticoagulant effect.

Overall, despite proposed mechanisms, none of these foods seem to act as intense “natural blood thinners” when consumed reasonably. But large amounts may potentially have minor anticoagulant effects.

Foods that can interact with blood thinners

Certain foods may not necessarily thin your blood themselves, but may interact with prescription anticoagulants like warfarin and increase the overall blood-thinning effect.

These interactions are likely due to the foods inhibiting the CYP450 enzymes in your liver, which are responsible for metabolizing many drugs. When these enzymes are less active, your body metabolizes the anticoagulant medication more slowly, potentially increasing its blood-thinning effect.

Foods that may interact with warfarin and related drugs include:

  • Cranberry juice
  • Grapefruit
  • St. John’s wort
  • Chamomile
  • Turmeric
  • Garlic
  • Ginkgo
  • Green tea

If you take warfarin or related medications, speak with your doctor before consuming large amounts of these foods regularly.

The verdict on natural blood thinners

Some foods and supplements, like garlic and ginger, do seem to have light anticoagulant properties. However, there is limited evidence from clinical studies to suggest that consuming them significantly thins your blood or reduces clotting in a meaningful way for most people.

Nonetheless, eating these foods in moderation is safe for most people and may contribute to overall cardiovascular health as part of a healthy diet.

Additionally, if you take prescription blood thinners, you should moderate your consumption of foods that may interact with your medication, like cranberry juice and turmeric.

But there is no high-quality evidence that “natural blood thinners” should replace anticoagulant medications prescribed by your doctor.

Are natural blood thinners safe?

For most people, eating reasonable amounts of foods with natural anticoagulant properties is likely safe and healthy.

However, some concerns exist about taking concentrated extracts, high doses, or combinations of these foods as supplements. Potential safety concerns with natural blood thinners may include:

  • Increased risk of bleeding or bruising when consumed in very high doses.
  • Enhanced effects of prescription anticoagulants, which may increase bleeding risk.
  • Poor regulation and inconsistent dosing with some supplements.
  • Allergic reactions or medication interactions.

To reduce any risks, talk to your doctor before taking supplements for their anticoagulant effects. And moderate your intake of foods that may thin the blood if you take blood thinners.

Safety tips for natural blood thinners

Some tips for safely consuming foods and supplements promoted for blood thinning include:

  • Avoid taking them in supplement form at high doses.
  • Moderate intake of foods like garlic, ginger, ginkgo, turmeric, etc. if you take warfarin or heparin.
  • Watch for signs of excessive bleeding and bruising.
  • Discontinue use if you experience negative side effects.
  • Consult your doctor before taking these products medicinally.

Foods that may promote clotting

While many foods are claimed to thin your blood, some may have the opposite effect and promote clot formation instead. These include:

  • Alfalfa sprouts – Rich in vitamin K, which is essential for clotting
  • Beef liver – High in vitamin K
  • Broccoli – Contains vitamin K
  • Kale – Leafy greens like kale are high in vitamin K
  • Soybean oil – Major source of vitamin K
  • Cheese – Fermented cheeses are high in vitamin K2
  • Beans – Contain vitamin K

For most people, moderate consumption of these foods as part of a balanced diet is fine. But people taking anticoagulant medications like warfarin should aim for consistent vitamin K intake daily.

Using natural blood thinners with medications

Anticoagulant medications like warfarin are powerful blood thinners used to treat and prevent blood clots. Their doses must be carefully controlled.

Introducing additional blood thinners from foods could enhance their effects and predispose you to bleeding problems. Thus, it’s important to moderate intake of foods with substantial evidence for anticoagulant effects.

It’s also vital to keep your vitamin K intake stable, as dramatic fluctuations can impact warfarin therapy. Speak to your doctor about dietary changes before introducing foods promoted as natural blood thinners.

Natural blood thinners to avoid with warfarin

Some foods those taking warfarin may want to avoid larges amount of include:

  • Garlic
  • Ginger
  • Ginkgo
  • Turmeric
  • Papaya
  • Green tea
  • Alcohol

Natural blood thinners that may be okay in moderation

Foods that are likely fine in moderation for people taking warfarin include:

  • Onions
  • Omega-3 fish oil
  • Cranberry juice
  • Dark chocolate

Again, it’s ideal to keep your intake of these foods fairly stable. Don’t dramatically increase or decrease consumption.

Lifestyle changes as natural blood thinners

Some evidence suggests that certain lifestyle measures may also mildly thin your blood, including:

  • Losing weight – Excess fat cells produce proteins that increase clotting. Shedding pounds may reduce clot risk.
  • Quitting smoking – Tobacco smoke damages your blood vessels and increases clotting risk. Quitting can help reverse these effects.
  • Drinking coffee – Coffee contains anticoagulant compounds. Moderate intake may reduce clot formation.
  • Exercising – Aerobic exercise helps improve circulation and may thin the blood slightly.
  • Reducing stress – Chronic stress raises cortisol and inflammation, which may promote excessive clotting.

While not potent “blood thinners” directly, these lifestyle measures benefit your overall cardiovascular health.

Signs of too-thin blood

While excess clotting can be problematic, blood that’s too thin comes with risks as well. Symptoms that your blood may be too thin include:

  • Easy or excessive bruising
  • Uncontrolled bleeding from minor cuts
  • Heavy or prolonged menstrual bleeding
  • Blood in the urine or stool
  • Bleeding gums
  • Nosebleeds

See your doctor if these symptoms occur, as your medication dosage or use of additional blood thinners may need adjustment.

Do natural blood thinners work?

Some foods and supplements do appear to have mild anticoagulant properties based on their mechanisms and some clinical research.

However, there is limited evidence from human studies that any of these act potently enough to substantially thin your blood when eaten reasonably.

Nonetheless, eating these foods moderately as part of an overall healthy diet is unlikely to be harmful for most people.

Speak to your doctor before using concentrated supplements for their anticoagulant effects or dramatically increasing intake of foods with blood-thinning reputations.


Certain foods may have mild blood-thinning effects, but human evidence for significant anticoagulant properties is limited. Though unlikely harmful in moderation, speak to your doctor before eating them in large amounts if you take blood thinners due to risks of excessive bleeding.

For people taking warfarin or related medications, aim for stable daily vitamin K intake and avoid suddenly increasing or decreasing consumption of foods like garlic, ginger, ginkgo, turmeric, and green tea.

Overall, focusing on a diet filled with varied fruits, vegetables, lean proteins, whole grains, and healthy fats benefits your cardiovascular system. An eating pattern like this helps thin your blood gently and naturally when paired with a healthy lifestyle.

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