A New Controlled Study Looked at CBD, Metabolism, and Insulin in Ponies — What Horse Owners Should Take Away

A New Controlled Study Looked at CBD, Metabolism, and Insulin in Ponies — Here's What Horse Owners Should Actually Take Away

If you own an easy-keeper or a horse your vet watches for insulin trouble, you've probably wondered whether a hemp or CBD supplement could help with more than just calm and comfort. A new peer-reviewed study out of a European veterinary team gives us an unusually clear-eyed answer — and the honest version is more useful than the hype.

Published in Frontiers in Veterinary Science in May 2026, the study followed a group of Connemara ponies through 21 days of oral CBD and then watched them for another five weeks afterward. Some of the ponies had equine metabolic syndrome; others were healthy. The researchers weren't asking "does CBD feel good?" — they were measuring hard numbers: body weight, body condition, triglycerides, insulin response to a sugar test, and exactly how the horses' bodies processed the CBD over time. That makes this one of the better-designed horse cannabinoid studies we've seen, so it's worth reading carefully rather than cherry-picking the good parts.

What the researchers found

Three takeaways stood out, and they don't all point the same direction — which is exactly why the study is worth your time.

CBD did not improve the metabolic measures. Over the 21 days, the researchers reported no significant improvement in body weight, body condition score, or triglycerides in the CBD group compared with the control group. In plain terms: in this trial, CBD did not act as a metabolic fix for the ponies with metabolic syndrome. That's an important thing for owners to hear, because a lot of marketing implies otherwise.

There was an insulin signal worth watching. During an oral sugar test, insulin concentrations rose significantly in the CBD group but stayed stable in the controls. The researchers were careful here — they couldn't tell whether this reflected a worsening of insulin regulation or simply a change in how insulin was being secreted, and they noted the groups had some baseline differences to begin with. But for horses already prone to insulin dysregulation, it's the kind of finding that says "loop your veterinarian in," not "help yourself."

The CBD itself behaved predictably and was well tolerated. On the pharmacology side, the news was reassuring: the ponies reached a steady level of CBD in their systems within about four to five days, elimination was slow, and the researchers observed some accumulation over the treatment window (roughly a 2.75-fold build-up). No adverse effects were reported. That predictable, slow-and-steady behavior is genuinely useful dosing knowledge — it's why consistent daily timing matters more than a one-off dose.

Why this matters for how you think about hemp for horses

Here's the honest frame. A supplement can support general wellness — calm during transport or a stressful farrier visit, everyday comfort — without being a treatment for a metabolic disease. This study is a clean example of that line. It found no metabolic benefit and raised an insulin question in a vulnerable group, while also confirming CBD was tolerated and behaved predictably. All of those things can be true at once, and a trustworthy source tells you all of them.

This is also where we think it's fair to show our own cards on the same honest ladder. HempMy Pet commissioned an equine study of its own at Tarleton State University (Texas A&M System) with Dr. Kimberly Guay, Ph.D., which looked at a completely different question — measures of stress during transport — and found reduced measures of stress, with a 0.6 mg/kg dose outperforming 0.3 mg/kg and effects peaking around four hours. That's a prospective study, and like the Connemara trial, it speaks only to what it actually measured. It doesn't tell you anything about metabolism or insulin, and we're not going to pretend it does. You can read the details on our equine study page and see how we place all of our research on the evidence ladder on our clinical trials page.

The practical upshot: if you're considering a hemp product for a horse — especially an insulin-sensitive one — the single most valuable move is a conversation with your veterinarian before you start, and a plan to monitor. Predictable pharmacokinetics like the ones this study reported are one more reason consistency and veterinary oversight beat guesswork. If and when you do move forward, our hemp for horses line and full third-party lab results are there so you know exactly what's in the bottle.

Frequently asked questions

Does this study mean CBD is bad for horses with metabolic syndrome?
No. It means CBD didn't improve metabolic measures in this small trial and produced an insulin change the researchers flagged for further study. It's a "talk to your vet and monitor" signal, not a verdict. The same study found CBD was well tolerated with no adverse effects reported.

How long does it take CBD to build up in a horse's system?
In this study, the ponies reached a steady state in roughly four to five days of consistent daily dosing, with slow elimination afterward. That's why steady, consistent timing tends to matter more than any single dose.

Is a 13-pony study something I should base decisions on?
It's a well-designed randomized controlled trial, which is strong on the evidence ladder — but it's small. Treat it as a high-quality signal that points to what larger studies should confirm, not as the final word. Your veterinarian, who knows your individual horse, is the right person to weigh it.

What can hemp reasonably support in horses, then?
The wellness-oriented evidence so far centers on things like calm and measures of stress during stressful events such as transport — that's what HempMy Pet's own Tarleton State study measured. General comfort and quality of life are reasonable wellness framings. Treating a specific disease is not, and no honest source should tell you otherwise.

Where can I read the original study?
It was published open-access in Frontiers in Veterinary Science in May 2026 — "Metabolic effects and pharmacokinetics of oral cannabidiol (CBD) in Connemara ponies following 21 days of treatment."