Equine nutrition coverage spotlights targeted supplement use

Equine nutrition companies are leaning harder into education around vitamin and mineral supplementation, as shown by new protected sponsored content from EQUUS and The Horse on “best” supplements and on the role of an equine nutritionist. Even without full article access, the related pages and source context show a familiar but important theme: supplement decisions are increasingly being framed as individualized nutrition strategy, not one-size-fits-all product selection. EQUUS’s article is associated with Mad Barn, and its nutritionist explainer sits within Sentinel’s “Ask an Expert Nutrition Series,” highlighting how manufacturers are using editorial-style education to shape decision-making in the horse health market. (equusmagazine.com)

That framing reflects a broader shift in equine feeding conversations over the past several years. Guidance from Ohio State says mature horses at maintenance may sometimes meet mineral requirements from high-quality forage alone, but horses in growth, reproduction, or performance stages often need complementary feed or supplementation to close nutrient gaps. The key variable is that forage composition is highly inconsistent, influenced by maturity, species, soil fertility, and weather, which is why forage analysis is repeatedly described as the only way to know mineral content with confidence. (ohioline.osu.edu)

The likely editorial angle of these new pieces also matches long-standing concerns in the field about the nutrients most often missed, and the risks of correcting them poorly. Stable Management, citing equine nutritionist Clair Thunes, PhD, reports that copper and zinc are commonly lacking in forage-based diets, while vitamin E can run low in hay-based rations because it degrades over time. The same article advises serum vitamin E testing in some horses, rather than assuming label claims or forage estimates are enough. That matters because deficiency risk is not evenly distributed across horses or management systems. (stablemanagement.com)

On the other side of the ledger, veterinary references continue to stress that over-supplementation is a real clinical concern. Merck notes that copper deficiency has been associated with developmental orthopedic problems, but also that excessive copper can interfere with selenium or iron metabolism. It also warns that horses are relatively sensitive to selenium toxicity, with both acute and chronic syndromes documented, and cites an NRC benchmark of 1 mg selenium per day for an average 500 kg horse in light exercise. Ohio State similarly cautions that vitamin toxicity, while uncommon overall, is more likely with fat-soluble vitamins because they can be stored in the body. (merckvetmanual.com)

Industry and educational materials are increasingly converging on the same practical message: supplementation should start with the base ration, not the product shelf. AAEP’s 2025 trace mineral handout emphasizes the role of zinc, copper, and other trace minerals in immune function, bone development, enzyme activity, and muscle function. Ohio State recommends using commercial concentrates, ration balancers, specific forages, or horse-labeled salt and mineral products to address documented shortfalls, and explicitly advises working with an equine nutritionist to maintain sufficient intake and correct ratios. (aaep.org)

Why it matters: For equine veterinarians, this kind of coverage is more than seasonal feed advice. It signals the kinds of questions pet parents are likely to bring into practice, especially as sponsored educational content becomes more sophisticated and product-specific. The clinical opportunity is to move those conversations toward evidence-based ration assessment: What is the horse actually eating, what does the forage analysis show, are there regional selenium issues, is the horse hay-only, and is there a reason to test serum vitamin E or involve a nutritionist? That approach can help prevent both under-supplementation and the quieter problem of stacking multiple products that create mineral imbalances. (ohioline.osu.edu)

There’s also a communication angle. Because the source articles are sponsored and protected, veterinarians may end up being the most trusted interpreters of the underlying claims. When a pet parent asks for the “best” vitamin or mineral supplement, the more accurate answer may be that the best option depends on forage quality, workload, age, reproductive status, and the rest of the ration. In many cases, a ration balancer or targeted correction may be more appropriate than adding another broad-spectrum supplement. That conclusion is an inference based on the guidance and expert commentary cited above, rather than a direct statement from the protected articles themselves. (ohioline.osu.edu)

What to watch: The next phase will likely be more decision-support content from feed and supplement brands, plus stronger emphasis on forage testing, serum vitamin E assessment in hay-fed horses, and nutritionist-guided ration balancing rather than blanket supplementation. (equusmagazine.com)