Bayou health | Is a Parasite Cleanse a Good Idea?

BY Nathan Morris, MD

I have been doing functional medicine for close to 20 years now.  I have seen a lot of trends come and go.  One that seems to have caught on and doesn’t seem to be dying out is the parasite cleanse. I am often asked about the need for this for gut and overall health. There are a lot of influencers who claim this is a must to be at optimal health, but what does the actual medical data say?  Research and what it shows is never really discussed with so many trends we see and should be, just like this one.  Let’s look at parasites and the role they play in our health and whether we need to be actively trying to rid ourselves of them.

Historically, parasites, like bacteria, have been a part of our gut microbiome since the beginning.  Certain parasites were beneficial and certain parasites were bad for us, the same as bacteria in the gut can be.  We developed a synergistic relationship with them, and everyone benefited, the parasites and the person who had them.  Now, there are parasites that are not beneficial for us.  Everyone knows about tapeworms and how they affect us by stealing our nutrients or getting severe diarrhea from Giardia when you go camping.  Most parasites in a developed country are not the kind who do harm, however.  Matter of fact, it is almost impossible to find parasites in stools in a developed country as I have done hundreds of DNA stool tests for parasites and they are rarely positive.  So, what is this trend about if parasites are often beneficial and rarely show up in the average American stool?  

The “parasite cleanse” has exploded as a viral wellness trend across social platforms like TikTok and Instagram, aggressively driven by holistic health influencers who claim that a staggering majority of the population unknowingly harbors harmful intestinal worms. The core logic popularized by these creators relies on attributing a wide array of everyday, ambiguous ailments—such as chronic bloating, unexplained fatigue, brain fog, intense sugar cravings, and teeth grinding—to these undetected parasitic organisms. Influencers frequently argue that because humans routinely deworm their household pets, they must perform the same periodic internal maintenance on themselves to achieve optimal biological health. To execute this, they typically recommend structured, multi-week regimens centered around proprietary supplement kits, specialized liquid tinctures, or DIY homemade herbal remedies. These protocols heavily feature potent botanical ingredients known historically for antiparasitic properties, most notably bitter wormwood, black walnut hulls, cloves, and crushed papaya seeds. Followers are urged to consume these blends daily to induce intensive bowel movements designed to aggressively flush out the digestive tract. Proponents frequently present highly graphic video clips of normal intestinal mucus or dietary fiber strings as “proof” of expelled worms, framing these intense, laxative-heavy routines as essential seasonal detoxes necessary for modern living.  Unfortunately, the data we have does not support this, not even a little.

There are some good medical arguments for why we should not randomly do these “parasite cleanses”

1. Lack of scientific evidence and what parasite you are you treating

• There are no rigorous trials showing there is benefit in doing a “cleanse” or even there is ever a need for them.

• Treating parasites is very specific. This means depending on the parasite you might have, treatment requires very specific antiparasitic.  If you have a tapeworm it is going to be a very different treatment than if you have hookworms.   Using broad spectrum herbals is a shotgun approach and like a shotgun can cause damage and not be focused.

2. Visual identification of “expelled worms”

• When a person uses a cleanse, the proof they needed it is the “worms” they see in their stool. 

• In a pivotal paper, “Not everything that wiggles is a worm: Pseudoparasites in parasitology” they found that what people identify as parasites is usually

i. Mucus strands from the gut

ii. Undigested fiber

iii. Expelled Cellular lining from the harshness of the herbs used.

3. Herbals can be very harsh and being a natural remedy does not imply that it is a safe remedy

• Black walnut and wormwood are often used in these cleanses and have definite side effects on nervous system, kidneys, and GI tract.

• These are not “bad” herbs.  They are often used for helping with tick borne disease parasite, babesia, but must be monitored by a doctor who is knowledgeable in their usage for a very specific disease.

Are parasites beneficial for us?

Parasites are beneficial for us in a lot of cases.  Research into the “hygiene hypothesis” suggests that modern, sanitized environments lack the parasitic infections humans co-evolved with, contributing to skyrocketing rates of autoimmune and allergic diseases. Parasites, specifically helminths (intestinal worms), survive by actively dampening their host’s inflammatory responses. Clinical studies on “helminthic therapy” demonstrate that controlled parasitic infections can benefit patients with hyperactive immune systems. By increasing our immune systems tolerance, parasites help suppress the harmful, unchecked inflammation characteristic of diseases like Crohn’s, Multiple Sclerosis, and severe asthma. Essentially, research indicates our immune systems may rely on these symbiotic organisms to prevent autoimmune self-attacks and healthy individuals are more likely to have parasites than unhealthy people.

There is a fundamental need in humans to create simplicity in a complex world.  A need for a black and white answer of whether something is good or bad.  Just like us humans, it is not that simple when it comes to parasites.  Just because one causes harm does not mean all of them do.  We must be aware that there is complexity in complex systems like the human body and if someone is selling you a “magic hammer” doesn’t make everything a nail.  Parasite cleanses are not the thing you are missing on your path to wellness.