Several foods contain compounds that can paralyze or kill intestinal parasites in lab and animal studies, and a few have shown promise in small human trials. Pumpkin seeds, papaya seeds, and certain bitter herbs top the list. That said, none of these foods replace prescription antiparasitic medications, which remain the most reliable way to clear a confirmed infection. Here’s what the evidence actually shows for each one.
Papaya Seeds
Papaya seeds have the strongest human evidence of any food on this list. In a pilot study of 60 Nigerian children with confirmed intestinal parasites, those who received a mixture of dried, ground papaya seeds and honey had their stools cleared of parasites 76.7% of the time within seven days. The comparison group, which received honey alone, saw significantly lower clearance rates. The active compounds are enzymes called proteases, particularly one that breaks down proteins in the outer covering of worms.
To use papaya seeds, you can scoop them from a ripe papaya, dry them, and grind them into a powder. The study used about 20 mL of the seed-and-honey mixture as a single dose. The seeds taste peppery and slightly bitter, so mixing them with honey or blending them into a smoothie makes them easier to get down.
Pumpkin Seeds
Pumpkin seeds have been used as a folk remedy for intestinal worms for centuries, and modern research has started to explain why. An in vivo study confirmed that pumpkin seed extract was effective against intestinal nematodes (roundworms) at a dose of 8 grams per kilogram of body weight in mice. The antiparasitic effect appears to come from a combination of compounds: an amino acid called cucurbitine, fatty acids, and two alkaloids (berberine and palmatine) that were identified in pumpkin seeds for the first time in that study.
These compounds work together to impair parasite movement and attachment to the gut wall, making it easier for your body to expel them. The practical approach is simple: eat a generous handful of raw, unsalted pumpkin seeds daily. Roasting at high temperatures may reduce the potency of some active compounds.
Garlic
Garlic contains allicin, a sulfur compound released when you crush or chop a clove. Allicin damages the cell membranes of several types of parasites, and lab studies show it can inhibit the growth of common gut parasites like Giardia. The catch is that allicin is unstable. It breaks down quickly with heat, so cooked garlic is far less potent than raw garlic. Crushing a clove and letting it sit for 10 minutes before eating maximizes allicin production. Two to three raw cloves per day is the amount most commonly referenced in traditional use.
Wormwood
Wormwood (the bitter herb used historically in absinthe) contains thujone, a compound that disrupts nerve signaling in parasites by blocking a key receptor in their nervous system. This essentially causes paralysis. Wormwood has a long history in traditional medicine as a deworming agent, and it’s a core ingredient in many commercial “parasite cleanse” supplements.
However, the same nerve-disrupting property that makes thujone effective against parasites also makes it potentially dangerous to humans at high doses. Excessive consumption can cause seizures and other nervous system disturbances. People with epilepsy should avoid it entirely. If you’re considering wormwood tea or supplements, stick to small amounts and short durations.
Pomegranate
Pomegranate rind and peel contain a class of compounds called ellagitannins, particularly one called punicalagin and another called ellagic acid. These compounds have been shown to inhibit the growth of malaria parasites in lab studies and have broader antiparasitic properties. The relevant compounds are concentrated in the peel and the white pith rather than the juice or the seeds you eat. Pomegranate peel tea, made by simmering dried rind in water, is the traditional preparation. The fruit itself provides some of these compounds but in lower concentrations.
Other Foods With Antiparasitic Properties
A few other foods show up consistently in the research literature:
- Carrots: High in beta-carotene, which may support the gut lining’s immune defenses against parasites. Shredded raw carrots also add bulk that can help move parasites through the digestive tract.
- Coconut and coconut oil: Contains lauric acid, which the body converts into a compound that can damage the lipid membranes of certain parasites. Extra-virgin coconut oil retains the most lauric acid.
- Pineapple: Contains bromelain, a protein-digesting enzyme similar in function to the proteases found in papaya seeds. It may help break down the protective outer layer of worms.
- Ginger: Lab studies show ginger extract can kill parasite larvae and reduce egg production in adult worms. Fresh ginger is more potent than dried.
Why Fiber Is More Complicated Than You’d Think
You might assume that eating lots of fiber would help flush parasites out mechanically. The reality is more nuanced. A recent study found that mice fed diets supplemented with inulin (a type of soluble fiber found in onions, garlic, and chicory root) actually developed chronic whipworm infections. The fiber disrupted the normal immune response at the gut lining, suppressed the body’s natural antiparasitic defenses, and caused overgrowth of harmful bacteria during infection. When researchers removed the inulin from the diet within a critical window, immune function bounced back and the mice could fight off the parasites again.
This doesn’t mean fiber is bad. It means that during an active parasitic infection, loading up on prebiotic fiber supplements could theoretically work against you by dampening the immune response your body needs to clear the infection. Whole foods with natural fiber in normal amounts are a different story from concentrated fiber supplements.
Risks of Herbal Parasite Cleanses
Many commercial parasite cleanses combine wormwood, black walnut hull, and clove in capsule form. All three carry real risks at high doses or with prolonged use. Clove oil in large amounts can damage the liver and kidneys and has blood-thinning properties that interact with anticoagulant medications. Black walnut hull taken in high doses or for extended periods can cause liver damage. Wormwood, as noted above, is neurotoxic in excess.
These risks multiply when you take all three together for weeks at a time, which is what most commercial cleanse protocols recommend. If you do use these herbs, shorter courses at lower doses carry less risk.
Foods vs. Medical Treatment
Prescription antiparasitic drugs work faster, more reliably, and at known doses. Standard medical treatment for common intestinal worms is often a single oral dose that clears the infection in one day. These medications are well-studied, widely available, and inexpensive.
The foods described above can support your body’s ability to resist or reduce parasitic infections, and some (like papaya seeds) show genuinely impressive results in small studies. But a confirmed parasitic infection, especially one causing symptoms like weight loss, persistent diarrhea, or visible worms in stool, calls for proper diagnosis and targeted treatment. Antiparasitic foods work best as a complement to medical care or as a preventive strategy, not a replacement for it.