ESTABLISHED 2006
Over 50,000 Orders Shipped
NEXT DAY UK DELIVERY
Worldwide Shipping 3-5 Days
SUBSCRIPTIONS
Subscribe & Save!
RATED  ★ ★ ★ ★ ★
1100+ 5* Reviews

Are Parasites the Root Cause of Your Horse’s Symptoms?

Carol Moreton • 20 March 2025

Beyond worms: the hidden connection between parasites, toxins, and chronic symptoms

If you’ve followed us and our blogs over the years, you’ll know that I’ve talked a lot about multiple mystery health symptoms and the importance of resetting the inner engine at cellular level to reverse those symptoms.


And yet it still goes on - in our fast-paced domesticated horse world, chronic health problems seem more widespread than ever. But what if the root cause of these mystery symptoms - like fatigue, joint pain, and digestive issues - could be traced back to a surprising relationship between parasites and toxins?


In this blog we're going to be exploring the world of parasites, and why they keep our horses stuck in a cycle of mystery health symptoms. When these mystery long-term health symptoms go unchecked, they turn into real medical diagnoses - fatigue and low energy, mood and behavioural changes, autoimmune allergy reactions, joint pain and skin issues. In short, our horse is not feeling at all well.


If you’ve read our ‘From Symptoms to Solutions’ page, you’ll have read that the four main root causes of our modern-day health problems are:


  1. Chronic infections
  2. Environmental toxins
  3. Nutrient deficiencies
  4. Stress and trauma


What I really want to showcase in this blog are the connections between infections – specifically parasites – and toxins in the body, but I want to set us up and talk a little bit about the background behind what's not working first.


Back in 2006, I made the shift to the natural medicine world and the IFM (Institute of Functional Medicine) after watching my horses struggle with severe health issues. Initially learning from my IFM mentors about the ‘why’ behind detoxing, I also mentored with the world's top authorities on the importance of functional lab tests, gut tests, toxin panels, adrenal assessments.


At the time, the prevailing belief was that low energy and mystery health symptoms were rooted in adrenal burnout, hormone imbalances, thyroid dysregulation, blood sugar spikes, food intolerances, aging, and genetics. While these are still key players in chronic disease, one thing became clear as science progressed ...


It’s not just about detoxing - it’s about detoxing the right way.


As science would now have it, practitioners have been detoxing out of order, with the framework and system backwards – there’s another layer underneath that we need to look at. The right approach involves asking deeper questions to uncover the root cause of the problem, much like an engineer would troubleshoot an issue on a production line, and ask ‘
How’ and ‘Why’ is this happening?


So, let’s say a horse is clearly in pain; we think it’s coming from the gut as there’s bloat, plus they don’t like to be touched, but they’re also miserable, sluggish, and not moving well. Instead of stopping at ‘gut problem’, we need to peel back the layers – what’s going on underneath, and maybe underneath that as well?


It’s like an iceberg - most of the problem is hidden out of sight. There’s a disconnect between the symptoms and the actual root cause. So we need to keep asking: what else needs investigating? What’s driving the adrenal, thyroid, and blood sugar imbalances? Are food intolerances involved, or is something deeper at play? The answers often lie in what’s unseen.


So let’s go back to those four root causes, and of course there are always going to be subcategories in each of these to consider.


For example, if we look at the environmental toxin category, we've got mould, we've got heavy metals, we’ve got the chemicals  - pesticides, herbicides, fungicides and so on. Then there’s nutrient deficiency, which can stem from PUFAs  (polyunsaturated fatty acids), UPFs  (ultra-processed foods), and what I call C.R.A.P.  -   which stands for carbs, refined, artificial, and processed foods, aka junk food.  And as for toxins - well, you know I could talk about those for hours!


Anyway, today, I want to focus on the chronic infection category, and particularly parasites, especially as we’re at the time of year when we should be running Spring FECs, and testing for tapes.


The chronic infection category

- types of equine parasites

When it comes to parasites, there are three main categories:


  1. Helminths – As horse owners, we’re all familiar with these. Also known as parasitic worms, they’re often visible to the naked eye. These parasites are difficult to combat and eradicate due to a lack of effective long-term strategies.

    The two main types are:
  2. Nematodes (roundworms)
  3. Platyhelminthes (flatworms), which include flukes and tapeworms.

  4. Protozoa – These microscopic parasites include Cryptosporidium, an intestinal protozoan that can cause diarrhea, dehydration, and weight loss in horses. It’s commonly found in contaminated water and feed. Foals are particularly vulnerable, especially if they’re immunocompromised or stressed, meaning they didn’t get the chance to establish a robust gut biome from birth. Other risk factors include management practices, and interestingly, the presence of dogs.

  5. Ectoparasites - i.e. lice, ticks, fleas, mites, which live on the outside of their hosts.
     

Today I'm going to be talking about the first two - helminths  and protozoa, the parasites that live inside the host.


Nematodes: the most common creature on Earth

Here’s a mind-blowing fact: nematodes are the most common animal on the planet. For every single human, there are an estimated 57-billion nematodes. Yes - billion. Per person. In fact, the World Health Organization (WHO) estimates that one in four people (25%) worldwide has a parasite infection.


Now, let’s bring it back to our horses. The primary class of internal parasites causing health issues in horses are nematodes, which include:


  • Large and small strongyles
  • Roundworms
  • Tapeworms


Other internal parasites, such as threadworms, pinworms, and botfly larvae, are (apparently) considered of lesser significance - though that may depend on who you ask!


Strongyloides: the persistent parasite

Let’s take a moment to talk about strongyloides. This parasite can trigger a range of symptoms, including:


  • Abdominal pain, diarrhea, constipation, and bloating
  • Respiratory issues, as it tends to migrate to the lungs, often leading to a dry, persistent cough
  • Severe complications in immunocompromised horses

 

There’s now a school of thought linking strongyles to chronic respiratory conditions in horses. Many cases of reactive airway disease (RAO) - the ones that never seem to fully resolve - may actually have a parasitic component. Because conventional diagnostics often miss this link, the default veterinary response tends to be a diagnosis of ‘asthma’ and a prescription for an inhaler.


Beyond the lungs, strongyles may also contribute to arthritis, kidney issues, and even heart conditions.


Another disconcerting fact about strongyles is the female can live up to 5-years inside the body. And because it doesn't follow a 90-day lifecycle, the cycle repeats with its offspring, allowing these parasites to set up camp and stay for the long haul.


Tapeworms

Now let’s talk tapeworms. Their symptoms often overlap with other parasitic infections -  abdominal discomfort, nausea, diarrhea, but they don’t just stay in the gut. These parasites can migrate into various tissues, potentially causing:


  • Brain-related issues
  • Hunger pains and unexplained weight loss
  • Vitamin deficiencies - especially B12 depletion, as tapeworms are notorious for skimming this vital nutrient from their host.


There's also a dog tapeworm, fox tapeworm, rat and cat tapeworm. Making our stable yards a hotspot for all four!  


Cryptosporidium protozoa: a waterborne nightmare

Now let’s shift gears and talk about Cryptosporidium protozoa - a parasite with a disturbing resilience. The bad news? It can survive standard water treatment processes.


Large-scale human outbreaks have been on the rise due to contaminated drinking water:

  • In 1993 over 400,000 people in Wisconsin were infected after a water treatment failure.
  • In 2016 more than 1,000 people fell ill due to Cryptosporidium contamination in swimming pools and water parks.


And for some of us out there, when I think back to when I was a kid – we used to drink out of ditch water and water hoses. I shudder now to think of the chemicals I would have ingested, especially from those hot plastic hoses!


Growing up in the countryside in the 1960s, wells were common, meaning that we were also more exposed to these types of parasites that could linger in the body for decades. I still remember my brother and I getting a healthy dose of salmonella from a picnic beside a stream in a cow field.


Other protozoan parasites to watch for:

  • Blastocystis – Often linked to IBS and chronic urticaria (hives). Ever seen a horse develop random hives for no apparent reason? This could be a factor.
  • Toxoplasma gondii – The infamous cat-related parasite, capable of persisting in the human body for years. While it’s usually harmless in healthy adults, it can cause serious complications in immunocompromised individuals or during pregnancy.


And on that note, cat owners - those of us with litter trays (myself included, with three rescue cats who don’t quite understand ‘outdoors’) - take note! As this links us nicely to, um, the ‘crazy cat lady’ syndrome. Toxoplasma gondii likes to migrate, with a real affinity for the brain, and it also likes to go to the lungs and muscle tissue. Once inside the body, it can lie dormant for life and may reactivate in immunosuppressed individuals. In other words, you can live and die with this thing.


But here’s where it gets really fascinating (or mildly alarming) – kind of a funny-not-funny thing. We’ve all heard of the crazy cat lady stereotype -  the one with a dozen cats and a touch of eccentricity. Well, it turns out there might be a scientific reason between toxoplasma gondii and brain function, being scientifically linked to mental disorders, behavioural changes, and well researched and connected with schizophrenia. Let that sink in!


And then there’s our dogs, who carry parasites yet we let them lick all over us. They wipe their butts on our floors with their little butt-scraping thing across the carpet, while their fleas and ticks also carry parasites which can pass over to us. A little food for thought the next time your pup plants a big sloppy kiss on you!



The parasite:toxin connection - a flooded system

- how parasites impact your horse’s health

So now we’re going to bring toxins into the discussion because we can’t talk about parasites without also talking about toxins - they go hand in hand.


Picture a bathtub overflowing - water spilling onto the floor, seeping under furniture, cascading down the stairs like a waterfall, soaking into every corner of the house. Now, visualise the same scenario inside your horse’s body. Overflowing toxins, seeping into cells, tissues, organs, and major systems, triggering a cascade of symptoms that leave your horse feeling miserable and exhausted.


Meanwhile, the immune system is scrambling to contain the damage - working to get those toxins away from vital organs like the brain, heart, liver, and lungs. If left unchecked, these toxins fuel chronic inflammation and eventually autoimmune disorders.


The parasite’s role: friend or foe?

So what’s the toxin connection with parasites? Here’s the big picture: parasites are like sponges for toxins.


If you take anything away from this blog, let it be this - parasites soak up toxins, helping to keep them away from cells and organs. In a strange way, it could be said that they’re trying to help. Yet at the same time, we’re seeing a rise in parasite infections - and they’re hurting the body as well.


Research suggests that the increase in toxins may be fuelling the increase in parasite infections. Science hasn’t proven causation yet, but when you plot the rise in toxin accumulation alongside the rise in parasite infections, the correlation is undeniable. The body is now dealing with more toxins than ever before.


So are parasites a necessary evil? One researcher likened parasites to speed bumps - annoying, but there for a reason, to keep the neighbourhood safe.


So oddly, the thinking is that parasites may actually be playing a protective role - helping the body buffer the damage from toxins. The immune system seems to allow parasites to stay because, as far as survival is concerned, toxins are a greater threat than parasites. It’s a conundrum - the body tolerates parasites to manage toxins, but in doing so, it also allows parasites to make the body sick.


How to support your horse’s gut & eliminate parasites naturally

So, what’s the solution? How do we clear parasites and toxins to reverse our horse’s mystery health symptoms?

No surprise here - it all starts with the gut microbiome. Why? Because 70-80% of the immune system is produced and housed in the gut. Strengthening the gut biome is the first step in fortifying the body’s defences and shifting the balance.


The gut communicates with every other body system, acting as the control centre for immune responses. When a toxin or pathogen enters the body, the gut signals the immune army to launch an attack. Meanwhile, the gut is operating like a car engine, delivering the energy to make the car drive. But here’s the kicker: the body needs extra energy to heal from toxins and parasites and nutrient deficiencies and stress and trauma.


The gut is more than just digestion - it’s a hormone, vitamin, and neurotransmitter factory, and it needs to be, because because parasites hijack serotonin - the body’s ‘feel-good’ neurotransmitter - to use for their own communication and reproduction. All the more evidence that if the body has an adrenal or thyroid or brain health problem, it’s actually got a gut problem, because all these systems rely on hormones produced in the gut.


Testing & strategy - the only way forward

We can't eliminate our horse’s parasites and clear up their inflammation and all their mystery health symptoms unless we know what we’re dealing with. And yes, while some parasites live beyond the gut, we still need to start there - supporting the immune system and improve energy production while we clear out those toxins and parasites.


Parasite cleansing isn’t an overnight fix - it can take anywhere from 30-60 days or longer. And here’s the catch - if we don’t do it properly, we’ll stay stuck in the same cycle.


This is why outdated gut protocols aren’t working - probiotics alone won’t fix this. They're popular, but do they really work? Despite their widespread use, many probiotic products fail to survive stomach acid or provide inconsistent results - only 15-25% of people report benefits, while others experience no change or even worsening symptoms.


The role of diet & prebiotics in equine gut health

In horses, the challenge is even greater, as no probiotic mimics the natural hindgut bacteria colonies. Plus, without addressing root causes like stress or diet imbalances, probiotics alone often fall short. The real solution? Feeding probiotically to get the prebiotics to the hindgut fibre fermenting microbes. This means  a diet rich in grass forage, prebiotic fibres, and gut-supporting phytonutrients -  to naturally stabilise the GI tract, support gut flora, and restore balance. Which means - if you’ve tried a gut-healing protocol before but your horse still has symptoms, it’s time to rethink the approach.


In the last 10 years, our understanding of the gut has evolved dramatically - and updates keep coming. What we knew even five years ago is being refined, reworked, and replaced with new insights - the science is moving fast. But also, we work with thousands of clients year-round, which means we see real-time what works and what doesn’t. We pivot quickly as new research emerges, because staying stagnant isn’t an option. No question - in 2025 we know more now than we did in 2015, and if we stuck to the same protocols and practice, we'd get left behind and we’d be failing our clients today.


So, let's talk about what an updated gut healing system looks like. We now know that parasites and toxins are inseparable - parasites live alongside toxins, soaking them up like sponges, but, as we’ve seen, it comes at a cost to our horse’s health.


The right way to detox & remove parasites

So what’s the updated strategy?


  1. Supercharge the mitochondria – The body’s cells produce 90% of the body’s invisible and physical energy through the mitochondria. Think of it like weightlifting - you can’t lift a 10kg dumbbell without building muscle first. Healing inflammation requires strong mitochondria to flush out toxins and parasites.

  2. Open the body’s internal drainage pathways – Before we can shift the toxins out, we need to open the exits. But what do we mean by internal drainage pathways? We mean fascia, we mean the lymphatics, we mean the kidneys, liver, bowels, skin - like unclogging the pipes of a clogged sink. But if there's overflow, where does it go? It goes into the brain, the skin, the organs, the soft tissue. It makes the body achy and foggy and tired and itchy and stinky when you try to clear this stuff out, if you haven't opened up the drainage pathways first.

  3. Use the right binders – Not all detox methods are created equal. Beyond opening drainage pathways, the gut restoring protocol has to have support from gentle toxin removal while you simultaneously kill the parasites. We want to be mopping up the toxins at the same time as we kill off the parasites. And not all binders are created equal either - certain binders will achieve this easily, while others will actually bind up the beneficial bacteria and nutrients along with the bad stuff. So, here's our Public Service Announcement for everyone.

  • Avoid outdated binders like activated charcoal and clay - they’re old-school and don't discriminate what they bind to, taking away the beneficial microbes and nutrients along with toxins.
  • Instead, use humic and fulvic acids with activated carbons - they’re the gold standard for mopping up toxins while preserving nutrients.
  • Equally, spirulina helps promote a balanced intestinal biome by binding to harmful mycotoxins in the digestive system, helping to protect gut health and performance. This in itself enhances immune resilience and metabolism.


And here’s the thing - when we get this right, parasites simply let go. And when that happens?

  • Our horse’s bloat disappears.
  • Their energy skyrockets.
  • Their focus improves.
  • Nutrients are absorbed properly again.


And the best part? Our horse gets their life back.


Final thoughts - the iceberg below the surface

Let’s circle back to where we started, and bring it back to that list of symptoms and diseases that we started with. They aren’t random. They’re rooted beneath the surface, like an iceberg hiding parasites, bacteria, and fungal infections below the waterline. But here’s the good news: it's all fixable.


Parasites and toxins are two sides of the same coin - where you find one, you’ll almost always find the other. And while parasites may seem like the enemy, they’re also a sign of a deeper imbalance - one that can be addressed and resolved.


The key? Work with the body, not against it.


  • Support the gut microbiome - because this is where immune strength begins. For a gut cleanse, see our SiboCARE; for ongoing intestinal maintenance see our BiomeTonic.
  • Open the body’s drainage pathways - so toxins and parasites can actually leave. See our LKLCARE.
  • Use the right binders - to mop up the mess without stripping vital nutrients. See our organic Spirulina.
  • Support parasite clearance naturally - feed phytonutrient anthelmintics to naturally expel intestinal parasites. See our VermClear for strongyles, roundworms, pinworms and botfly larvae, & Pumpkin Seeds for tapeworms.
  • Nourish/strengthen the mitochondria - because healing takes energy. See our Mineral Balancers & EnergyCARE.


When you get this right, you don’t have to fight parasites - they simply let go.


And when that happens? Your horse feels better, looks brighter, and thrives once again. Because at the end of the day, good health isn’t about eliminating symptoms - it’s about restoring balance. And balance starts in the gut, with a smarter approach to healing.


And if you do chemically worm? Protect the gut and liver with our BiomeTonic & LiverCARE.


Conclusion

Healing from chronic symptoms means addressing parasites and toxins in the right way. By focusing on gut health and supporting the body’s natural detoxification processes, you can restore balance and eliminate mystery symptoms - without the endless cycle of trial and error.


It’s about working smarter, not harder - parasites can hide anywhere in the body, and their impact on our horse’s health should never be underestimated. But more than anything, this is my love letter to the horse community, because every horse deserves to thrive, not just survive. When we get it right, the results come quickly.


The EquiNatural Blog

Horses grazing on spring pasture with grazing muzzle
by Carol Moreton 1 April 2025
Lush spring grass can trigger EMS & IR in horses. Discover smart, simple strategies to support metabolic health this season with EquiNatural.
by Carol Moreton 6 March 2025
Is your horse struggling with headshaking? Discover how stress, environmental changes, and allergies contribute to headshaking in horses. Learn expert-backed strategies for stress management, craniosacral therapy, and natural remedies to support your horse’s well-being this spring.
Horse experiencing histamine intolerance due to KPU and spring allergies
by Carol Moreton 4 February 2025
Spring allergies, itching, & congestion? The culprit might be KPU! Learn how histamine intolerance, hindgut health, & liver detox are all connected.
by Carol Moreton 21 January 2025
Discover how vaccines impact your horse’s inflammation levels and immune system. Learn practical tips for recovery, including anti-inflammatory diets and stress reduction strategies.
Explore the myths, legends, and herbal traditions of Christmas. Discover ancient lore, festive plant
by Carol Moreton 20 December 2024
Explore the myths, legends, and herbal traditions of Christmas. Discover ancient lore, festive plant meanings, and tips for safely incorporating herbs into your horse’s care.
by Carol Moreton 18 December 2024
Discover the connection between chronic stress, inflammation, and gut health in horses. Learn how to restore balance naturally with diet, prebiotics, and herbal support.
Image of feathered cob ponies prone to mallenders sallenders
by Carol Moreton 1 December 2024
Discover the genetic, metabolic, and detoxification links behind mallenders in horses. Learn how addressing gut and liver health can manage this frustrating condition.
Image showing leaky gut tears in the small intestine.
25 November 2024
Learn how leaky gut affects your horse’s health, leading to inflammation, allergies, and fatigue. Discover solutions like L Glutamine and the full EquiNatural Leaky Gut Regeneration Programme to repair and strengthen the gut lining.
11 November 2024
Discover how steaming hay supports your horse's respiratory health and learn how to balance any protein loss with Essential Aminos for optimal nutrition.
Autumnal photo image of horse grazing peacefully on a frosty day.
31 October 2024
How to utilise a hard frost to naturally disrupt parasite cycles in horses, and explore supportive, gut-friendly feed options for effective winter parasite control.
More posts
Share by: