If you’ve ever had a horse diagnosed with insulin resistance or Cushing’s, you know this isn’t a one-and-done situation.
These conditions tend to show up slowly, evolve over time, and often bring other concerns along with them. Horses with insulin resistance, equine metabolic syndrome (EMS), or Cushing’s (PPID) are more prone to complications like laminitis in horses, which I’ve written more about in my guide on supporting horses with laminitis.
That increased susceptibility is exactly why management matters so much, and why many horse owners start looking for ways to support their horse beyond just the basics.
For me, that meant combining veterinary care, diet and supplement support, and essential oils into a whole-horse approach. Not one replacing the other, but everything working together.
When you look at these conditions this way, it stops being about finding one solution and starts being about supporting the entire system.
What Is Insulin Resistance in Horses?
The simplest way to understand insulin resistance is to think of insulin as a key, and your horse’s cells as doors.
Normally, insulin unlocks the door so sugar can enter the cell and be used for energy. With insulin resistance, that key doesn’t work properly. The doors don’t open the way they should, so sugar stays in the bloodstream.
The body responds by producing more insulin to try to compensate, and over time you end up with consistently elevated insulin levels. That imbalance is what increases the risk for complications like laminitis and other metabolic stress.
What Is Cushing’s Disease (PPID)?
Cushing’s disease in horses starts in the pituitary gland, which sits at the base of the brain and helps regulate hormones.
A simple way to think about it is that the signaling system becomes overactive. The pituitary gland sends too many messages, and the body responds by producing excess hormones. Over time, this can lead to changes like a delayed or abnormal coat, muscle loss, shifts in energy, and increased susceptibility to other issues, including insulin dysregulation.
It’s also very common for horses with Cushing’s to have overlapping metabolic concerns, which is why these conversations tend to go hand-in-hand.
Where Essential Oils Fit in a Metabolic Horse Program
Let’s be very clear about this, because it matters.
Essential oils are not a replacement for veterinary diagnosis, bloodwork, medication prescribed by your vet, diet and forage management, or hoof care. Those are foundational.
At the same time, essential oils are not just “extra” either.
There is research showing that essential oils can influence the nervous system, support a healthy response to inflammation, and interact with the body through the olfactory system in ways that affect both brain and body function. That means they can play a meaningful role in how a horse processes stress, maintains balance, and responds to its environment.
I like to think of this in terms of a circle of support.
Veterinary care, nutrition, environment, routine, and essential oils all sit inside that circle. Each one influences the others. When they’re working together, you get a very different result than when any one piece is missing.
What the Research Says About Essential Oils and Metabolic Health
There is emerging research looking at essential oils in horses with metabolic concerns, particularly around insulin regulation.
One study published in Frontiers in Veterinary Science looked at insulin-dysregulated horses given a plant-based essential oil blend orally over several weeks. The horses showed improvements in some markers of insulin sensitivity, especially those with more significant dysregulation.
If you’re curious, you can read the full study in Frontiers in Veterinary Science.
What makes this interesting is not just the outcome, but the compounds involved. Essential oils contain naturally occurring components like cinnamaldehyde, eugenol, thymol, and carvacrol, which have been studied in other species for their roles in metabolism, inflammation, and cellular signaling.
At the same time, this was a proprietary blend, and research in this area is still developing. So rather than treating this as a definitive answer, it’s better viewed as a strong indication that essential oils are interacting with metabolic pathways in ways that are worth paying attention to.
What I’ve Personally Used with My Metabolic Horses
This isn’t theoretical for me. I’ve had one horse with insulin resistance who went on to founder, and another with Cushing’s who also developed laminitis, which is something I go into more detail on in my laminitis support guide.
In both cases, I used essential oils as part of a broader plan that included veterinary care, appropriate supplements, and management changes.
The oils I kept coming back to were consistent, simple, and chosen for how they supported the horse as a whole.
Calming and Nervous System Support
For calming and nervous system support, I’ve relied heavily on lavender and Roman chamomile. Lavender is familiar to most people, but Roman chamomile became a favorite after seeing how clearly one of my horses responded to it. It’s gentle, grounding, and especially helpful for more sensitive horses.
If you want a deeper dive on how I use Roman chamomile with horses, you can read my Roman chamomile guide here.
I’ve also used vetiver when I wanted something deeper and more stabilizing for the nervous system.
Metabolic Support Oils
When looking at metabolic support, ginger and cinnamon come up frequently. Ginger is often associated with circulation and metabolic function, and it’s also referenced in discussions around essential oil compounds and metabolism.
Cinnamon is talked about extensively in the context of blood sugar and insulin sensitivity in other animals, which is why it continues to show up in conversations around metabolic horses.
While that doesn’t make it a proven treatment, it does make it relevant.
Whole-Body Wellness Support
For overall wellness, frankincense and copaiba have been staples for me. These are the oils I reach for when I’m not targeting a single issue, but instead supporting the body’s ability to stay balanced and respond appropriately.
There are also other oils you’ll see mentioned in this space, including lemongrass, basil, and geranium. Geranium is particularly interesting because of its association with hormone balance in aromatherapy, which makes it a natural fit for conversations around endocrine health, even if that connection is anecdotal.
Do Essential Oils Actually Work When Horses Smell Them?
How Essential Oils Affect the Brain and Body
This is one of the most common questions, and the answer is yes, there is more happening than just a pleasant scent.
When your horse smells an essential oil, tiny aromatic molecules enter the nasal passages and interact with receptors that send signals directly to the brain. These signals influence areas responsible for emotion, stress response, and hormonal regulation.
That’s why scent can have such a noticeable effect. It’s not just emotional, it’s neurological and physiological.
There is even research looking specifically at lavender and horses, showing measurable effects on stress responses, including changes in heart rate and relaxation behavior, which you can read more about in this lavender study on horses here.
How I Use Essential Oils in Practice
Aromatic Use
Aromatic use is often the starting point. Letting a horse smell an oil and observing their response can tell you a lot. Some will lean in, some will turn away, and that feedback matters.
Topical Use
Topically, I use oils along the spine as part of massage or bodywork. This can be as simple as a few drops diluted and applied during a quiet moment at the barn. It’s also where techniques like raindrop can fit in, especially if you’re already doing hands-on work with your horse.
Oral Use
Oral use is where things become more controversial, and it’s important to acknowledge that.
I do use essential oils orally with my horses, but I do so intentionally. Not every essential oil is created equal, and quality matters here. If you’re considering internal use, the oils need to be labeled appropriately and come from a company that is transparent about sourcing and testing.
I’ve personally visited the farms where my oils are produced, and that level of transparency is a big part of why I trust them.
If you want to explore the oils I personally use, you can browse them here.
When introducing oils internally, I always start with a single drop and make sure the horse will eat it. From there, I slowly increase. For my mini, that looked like three to five drops, and for a larger horse, up to around ten. Cinnamon, ginger, copaiba, and frankincense were the primary oils I used this way, typically mixed into a portion of feed.
It’s also worth noting that essential oils are not as foreign to the diet as they might seem. If you look at many commercial feeds, you’ll often find essential oils listed as flavoring agents or preservatives. Rosemary oil is one example, but others are used as well, which means horses are already being exposed to these compounds in controlled amounts.
Supporting the Whole Horse
Alongside essential oils, I’ve used supplements recommended by my veterinarian, including chromium for insulin resistance and chaste tree berry for Cushing’s. These are widely available and can be very budget-friendly depending on what you choose.
If you’re working with a vet, it’s always a good idea to ask what they prefer or recommend for your specific horse, especially when it comes to supplements and long-term management.
If you’re interested in incorporating essential oils more intentionally, it can be helpful to work with a veterinarian who is trained in aromatherapy or integrative care.
Most traditional veterinarians aren’t trained in essential oils, so if you ask about something outside of their scope, they’re often going to default to saying no. That doesn’t mean they’re wrong—it just means they’re working within the training they’ve been given.
If you want more guidance in this area, it can be really valuable to find a veterinarian who understands both sides.
There isn’t currently a simple, reliable directory specifically for veterinarians trained in aromatherapy. However, many holistic and integrative veterinarians do have experience with essential oils or are at least open to working with them appropriately.
You can start your search through organizations like the American Holistic Veterinary Medical Association, which offers a practitioner directory and can help you find veterinarians who take a more integrative approach
Final Thoughts
When you’re managing a horse with insulin resistance or Cushing’s, there isn’t one single answer.
There is a system.
Veterinary care, nutrition, environment, routine, and essential oils all work together. When they’re used thoughtfully and consistently, they create a level of support that no single piece can provide on its own.
Essential oils can be a part of that system.
And when you start to see them that way, they become a meaningful part of how you support your horse every day.
Want to Learn More?
If you’d like a simple starting point for using essential oils with your horse, I’ve put together a beginner-friendly guide to help you get started. You can access it here.
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