Natural Alternatives to Ivermectin: Do They Work?
Updated: Aug 19
Written by Dr. Charles Drew, Lead Pharmaceutical Content Specialist & Clinical Drug Information Reviewer
Reviewed for medical accuracy under the Ivermectinkart Editorial Policy
Introduction
Searches for natural alternatives to ivermectin often lead to papaya seeds, wormwood, garlic, herbal “parasite cleanses,” and other supplements. Some of these plants contain compounds with antiparasitic activity in laboratory experiments. That does not mean they can reliably clear a parasitic infection in people or replace ivermectin when it is medically indicated.
The evidence gap is substantial. A 2023 systematic review of medicinal plants for human gastrointestinal parasites included 162 studies, but 159 were experimental studies and only three were randomized controlled trials in people. Most of the research—78.4%—tested plant products in vitro rather than as treatments in humans.
There is another important issue: ivermectin is not one universal “parasite medicine.” Different parasites require different diagnoses and treatments. In the United States, the safest alternative to ivermectin is therefore usually another evidence-based treatment chosen for the specific condition, not an unverified herbal substitute.
What Is Ivermectin Actually Used For?
Understanding ivermectin's legitimate uses helps put the search for alternatives in context.
FDA-approved ivermectin tablets are used for intestinal strongyloidiasis and onchocerciasis, both caused by parasitic worms. Some topical ivermectin formulations have separate approved uses, including head lice and rosacea.
Ivermectin is also used off-label in some clinical situations. For example, oral ivermectin is not FDA-approved for scabies, but CDC lists it among first-line treatment options and notes that oral ivermectin and topical permethrin have similar efficacy for classic scabies.
That variety is why how parasitic infections are diagnosed matters before choosing treatment. A remedy that appears active against one worm, protozoan, or mite cannot automatically be substituted for treatment of another organism.
What about ivermectin for COVID-19?
FDA has not approved or authorized ivermectin to prevent or treat COVID-19. The agency states that available clinical-trial data do not demonstrate that ivermectin is effective against COVID-19 in humans.
Therefore, looking for a “natural version of ivermectin” for COVID-19 begins with a false assumption.
Neither ivermectin nor an herbal ivermectin substitute should be treated as an established COVID-19 therapy simply because a compound demonstrates antiviral effects in a laboratory experiment.
FDA also warns against using ivermectin products formulated for animals in humans because veterinary formulations are different and have not been evaluated for human use in the same way.
Are Natural Alternatives to Ivermectin Proven to Work?
No natural remedy currently has evidence strong enough to be considered a general replacement for ivermectin in conditions for which ivermectin is approved or recommended.
Researchers are genuinely investigating plants for antiparasitic activity. The 2023 systematic review identified 507 plant species studied against gastrointestinal parasites and reported significant in-vitro activity for dozens of them. But only three randomized human trials appeared among the 162 included studies.
That evidence distribution is important. Hundreds of positive laboratory experiments do not compensate for a lack of well-designed human trials.
The same review also found that only a minority of the plant species had toxicity evaluated before antiparasitic testing. That leaves uncertainty not only about whether many remedies work in people but also about safe formulations, concentrations, interactions, and reproducibility.
What Does the Research Say About Common Natural Options?
Several foods and herbs repeatedly appear in discussions of natural deworming. Their evidence is not equal, and none should be grouped together as a proven “natural ivermectin.”
Papaya seeds have limited human evidence
Papaya seeds are one of the more interesting examples because there actually are human data.
A small 2007 randomized pilot study enrolled 60 asymptomatic Nigerian children whose stool tests showed intestinal parasites. Participants received either a papaya-seed preparation with honey or honey alone, and the study reported greater parasite clearance in the papaya group.
A later Kenyan school study involving 326 children also reported reduced Ascaris lumbricoides egg counts among children receiving porridge containing papaya seeds.
These studies are signals worth researching, not proof that papaya seeds can replace ivermectin. They involved specific intestinal parasites, children in particular settings, different preparations, relatively limited evidence, and did not establish papaya as a treatment for ivermectin's FDA-approved indications such as strongyloidiasis or onchocerciasis.
Wormwood has a long history but weak replacement evidence
Wormwood species have a history of traditional antiparasitic use, and laboratory or animal research has identified compounds with biological activity.
However, the broader medicinal-plant literature remains dominated by preclinical studies. There is not adequate high-quality human evidence establishing wormwood as a dependable replacement for ivermectin for strongyloidiasis, onchocerciasis, or scabies.
Safety also matters. Wormwood products can differ chemically, and thujone-containing botanicals raise neurological safety concerns at sufficiently high exposure. “Plant derived” should therefore not be interpreted as “risk free.”
Garlic shows antiparasitic activity mainly in early research
Garlic contains biologically active sulfur compounds and has demonstrated antiparasitic effects in laboratory and animal investigations involving several organisms.
That evidence does not establish ordinary garlic consumption or garlic supplements as reliable treatment for human parasitic infection. Differences between a concentrated experimental extract and the amount or form consumed in food can be substantial.
Garlic remains a nutritious food for many people, but eating more garlic should not be confused with receiving a validated antiparasitic treatment.
Herbal parasite-cleanse mixtures have an even larger evidence problem
Commercial “parasite cleanses” may combine herbs, supplements, restrictive diets, laxatives, or other approaches. NCCIH notes that detox and cleanse programs have generally been poorly studied and that some have been associated with safety concerns or misleading claims.
The NCCIH detox and cleanse guidance also warns that some cleansing approaches can cause dehydration, electrolyte disturbances, or other adverse effects.
Comparison: Evidence behind commonly discussed natural ivermectin alternatives
Option | Human antiparasitic evidence | What the evidence may suggest | Why it is not an ivermectin replacement |
Papaya seeds | Limited small human trials | Possible activity against some intestinal parasites | Evidence is parasite-specific and insufficient for ivermectin indications |
Wormwood | Mostly laboratory/animal evidence for parasite-related uses | Compounds warrant further study | Human efficacy, standardized products, and safety remain uncertain |
Garlic | Mainly laboratory and animal research | Biologically plausible antiparasitic activity | No established human treatment equivalent to ivermectin |
“Parasite cleanse” blends | Little reliable treatment evidence | Some ingredients may affect digestion or have laboratory activity | Unstandardized mixtures, uncertain efficacy, and potential safety risks |
Dietary changes alone | No evidence as parasite-eradication treatment | Good nutrition supports general health | Diet does not reliably eliminate established parasitic infections |
Why Laboratory Antiparasitic Activity Is Not Enough
Many claims for natural antiparasitic remedies begin with a statement that an herb “kills parasites in studies.” The key question is what kind of study.
A substance can kill a parasite in a laboratory dish at a concentration that is impossible or unsafe to achieve inside the human body. Digestion and metabolism can also change plant chemicals before they reach the infection site.
Animal studies provide another step toward understanding biological effects, but animals can absorb, metabolize, and respond to compounds differently from humans. Human trials are needed to establish whether an intervention actually clears infection with acceptable risks.
A plant killing a parasite in a laboratory is evidence for a research hypothesis—not evidence that swallowing that plant will cure a human infection.
Researchers also need clinically meaningful outcomes. Reduced parasite movement in a test tube, lower egg counts, improvement in symptoms, and confirmed eradication of infection are not interchangeable endpoints.
This distinction follows the evidence standards in the supplied medical-content guide: laboratory and animal findings can support biological plausibility but cannot establish clinical effectiveness or safe treatment in people.
Why “Parasite Cleanses” Can Be Misleading
Many symptoms attributed online to parasites—such as bloating, fatigue, loose stools, constipation, abdominal discomfort, or changes in appetite—are nonspecific. They can occur for numerous gastrointestinal and non-gastrointestinal reasons.
That is why parasite cleanse evidence should be evaluated separately from social-media testimonials or pictures of material passed in stool.
A laxative or cleanse may cause a person to pass mucus, plant fibers, stool material, or other debris. That effect is not evidence that parasites were killed.
NCCIH notes that cleansing programs can include fasting, juices, supplements, herbs, enemas, laxatives, or colon irrigation. It also reports limited evidence for many claimed benefits and warns that some approaches can cause diarrhea, dehydration, malabsorption, or electrolyte imbalance.
Supplements raise a separate regulatory issue. As of 2026, FDA does not approve dietary supplements for safety and effectiveness before they are marketed in the way it approves drugs, and products bought online or in stores may differ from formulations tested in research.
What Are Evidence-Based Alternatives When Ivermectin Is Not Appropriate?
The answer depends on what is being treated.
Strongyloidiasis
For acute and chronic strongyloidiasis, CDC identifies ivermectin as first-line therapy and albendazole as a medical alternative.
The CDC Strongyloides treatment guidance also explains that severe hyperinfection or disseminated disease requires specific medical management.
This is a particularly important infection not to self-treat. Strongyloides can persist for years, and severe disease can occur when immune function is suppressed.
Scabies
Scabies is caused by mites rather than intestinal worms. CDC lists prescription permethrin 5% cream as an FDA-approved first-line treatment and oral ivermectin as another first-line option used off-label for classic scabies.
CDC explicitly states that no nonprescription over-the-counter products have been tested and approved to treat human scabies. Other prescription or compounded alternatives exist for particular situations, but selection depends on age, pregnancy status, disease severity, treatment history, and other factors.
Onchocerciasis
For onchocerciasis, or river blindness, CDC continues to identify ivermectin as the treatment of choice because it kills microfilariae. Doxycycline can target Wolbachia bacteria required by adult Onchocerca volvulus, but CDC notes that doxycycline does not rapidly kill the microfilariae and is not simply a one-for-one substitute.
Management can become especially complex with possible Loa loa coinfection because of the risk of serious reactions. This requires expert clinical assessment rather than an herbal substitution strategy.
The important pattern is that legitimate alternatives are diagnosis-specific. There is no single natural or pharmaceutical substitute that replaces ivermectin across every infection for which it might be considered.
Safety: When Not to Self-Treat a Suspected Parasite
Do not delay medical evaluation when a suspected parasitic infection involves persistent diarrhea, unexplained weight loss, significant abdominal symptoms, anemia, fever, blood in stool, neurologic symptoms, eye symptoms, or illness after travel to an area where particular parasites are common.
Extra caution is important for people who are pregnant or breastfeeding, children, older adults, people with weakened immune systems, and anyone preparing to receive corticosteroids or other immunosuppressive treatment. Strongyloidiasis is especially important in immunosuppressed patients because hyperinfection and disseminated disease can become severe.
Tell a clinician or pharmacist about herbs and supplements you use. NCCIH notes that dietary supplements can interact with medications and that many products have not been adequately studied in pregnant people, nursing mothers, or children.
A guide to herbal supplement safety can help readers assess interactions and labeling without assuming a product is safe merely because its ingredients are natural.
Do not substitute veterinary ivermectin for human medication. FDA has received reports of people requiring medical attention, including hospitalization, after self-medicating with ivermectin products intended for animals.
Conclusion
So, do natural alternatives to ivermectin work? Some medicinal plants—including papaya, wormwood, and garlic—have produced potentially interesting antiparasitic findings, but the evidence is mostly preclinical or based on limited human research. A large systematic review found only three randomized human trials among 162 studies of medicinal plants for gastrointestinal parasites.
That is not enough to consider these remedies reliable replacements for ivermectin.
When ivermectin is unsuitable, the appropriate alternative depends on the actual diagnosis. CDC guidance, for example, lists albendazole as an alternative for strongyloidiasis and permethrin as a first-line treatment for scabies, while ivermectin remains the treatment of choice for onchocerciasis.
Natural compounds may eventually contribute to new antiparasitic medicines. For now, their most defensible role is as subjects for further research—not as presumed substitutes for treatments with established human evidence.
Frequently Asked Questions
1 . Is there a natural substitute for ivermectin?
No natural product has been established as a general substitute for ivermectin across its medical uses. Some plants have shown antiparasitic effects in laboratory, animal, or limited human research, but the evidence is not equivalent to established treatments.The appropriate alternative depends on the specific parasite or condition.
2 . Can papaya seeds get rid of intestinal parasites?
Small human studies suggest papaya seeds may have activity against certain intestinal parasites, but the evidence remains limited. One randomized pilot study included only 60 asymptomatic children, and later research examined specific school-age populations and parasites.These findings do not establish papaya seeds as a replacement for ivermectin or other prescribed antiparasitic medicines.
3 . Does wormwood kill parasites in humans?
Wormwood has demonstrated antiparasitic activity mainly in laboratory and animal research, but reliable human treatment evidence is insufficient. The broader medicinal-plant evidence base contains far more preclinical experiments than randomized clinical trials.Wormwood products can also carry safety concerns, so “natural” should not be interpreted as harmless.
4 . Does garlic work as a natural dewormer?
Wormwood has demonstrated antiparasitic activity mainly in laboratory and animal research, but reliable human treatment evidence is insufficient. The broader medicinal-plant evidence base contains far more preclinical experiments than randomized clinical trials.Wormwood products can also carry safety concerns, so “natural” should not be interpreted as harmless.
5 . Does garlic work as a natural dewormer?
Garlic has compounds with antiparasitic activity in experimental research, but it is not an established human deworming treatment. Much of the relevant evidence comes from laboratory or animal studies rather than high-quality clinical trials.Eating garlic should therefore not replace diagnosis-specific treatment for a confirmed infection.
6 . Are parasite cleanses safe and effective?
There is not strong evidence that commercial parasite cleanses reliably eliminate established parasitic infections. NCCIH notes that detox and cleansing approaches are generally poorly studied and that some can cause dehydration, diarrhea, malabsorption, or electrolyte problems.Herbal ingredients can also interact with medicines or vary from products studied in research.
7 . What can be used instead of ivermectin if someone cannot take it?
The alternative depends entirely on the condition being treated. CDC lists albendazole as an alternative for strongyloidiasis and permethrin as a first-line treatment for scabies, while management of onchocerciasis may require specialist-directed therapy.A clinician can select an alternative based on the parasite, patient factors, contraindications, and current guidance.
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