Soy-Free Nutrition
100% Horse Safe
Bluebonnet® is proud to be an ionophore-FREE mill.
Locked Formulas
True-name ingredients that don't change - every bag, every bucket.
Your Choice
Some owners feed soy, some skip it. We've got great options either way.
build a soy-free program
Start with forage, then add the feed or balancer that fits your horse. Everything below ships straight from Bluebonnet®!
Alfa Nibblets™
FORAGE REPLACER & EXTENDER
Small 5/32" pellets that soak fast. Stretch your hay, replace it when you need to, or use a handful to carry a balancer.
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Pro Balance™
DIET BALANCER
One small scoop of pelleted vitamins, organic minerals, and amino acids for forage-first horses with a boost of biotin. The same technology found in our customers’ favorite Intensify® line.
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Limited
DIET BALANCER
For horses on extreme dietary restrictions. Free from soy, corn, wheat, oats, molasses, beet pulp, flax, and cottonseed, it provides essential nutrients perfect for pasture-only or forage-based diets in a 1-2lb serving.
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Learn on the go. Get the full story on soy with Feed Room Chemist Episode #78 - covering what soy is, where its reputation came from, and what the research shows.
Still wondering about soy?
Still wondering about soy?
Before you start pulling ingredients, talk it through with our nutrition team. We'll take a look at the whole picture with you. Always free.
Need answers NOW? Ask Blu® - our 24/7 digital nutrition consultant. You can always ask him to send your conversation to one of our experts, who follows up in 5-7 business days.
frequently asked questions
Is soy the problem? - Maybe, maybe not. Soy is one of those topics almost everyone has an opinion on, and skipping it is a perfectly good choice. Either way, it helps to know what the research actually says.
How is soy processed?
Most soy in horse feed isn't raw, whole beans. It's a “meal” made from soybeans. The beans are cracked, dehulled, separated from their oil, and heat-treated. This improves digestibility and leaves behind a meal rich in amino acids. The other result of this treatment is a highly-refined, protein-free, fat-rich oil (more on oil below).
What about the antinutritional factors in soybeans?
Raw soybeans contain natural compounds that help protect the plant but can get in the way of digestion. The main ones are protease inhibitors, which block the enzymes horses use to break down protein, and lectins, which can interfere with how nutrients are absorbed. Controlled heat treatment deactivates both protease inhibitors and lectins. That’s why raw soybeans aren’t fed to horses, but heat-treated soybean meal is.
Why is it so common in feed?
Protein quality comes down to amino acids. Soybean meal is one of the best natural sources of lysine, the essential amino acid most likely to run short in a horse's diet. Going soy-free means those amino acids have to be provided through other sources.
What about allergies?
Horses can be allergic to soy protein, though true food allergies are rare. Allergy blood tests can be unreliable, too. In one study, healthy ponies tested "positive" for feeds like soy, then showed no reaction when fed them. A carefully managed elimination diet is often a more reliable way to find a true sensitivity.
What about soybean oil?
Allergic reactions come from proteins, and highly refined soybean oil contains virtually none. That's why U.S. food law doesn't count soybean oil as major food allergens for people.
What about phytoestrogens?
Research in horses is limited, but one study found mares fed soybean oil had no change in cycle length or hormone levels (Crain et al., 2015). These natural compounds are also found in many plant-derived ingredients and forages other than soy. For example, a diet rich in alfalfa can supply more phytoestrogens than a soy-containing feed. (Kentucky Equine Research).
Sources
- Adkin, A. M. 2018. The Characterization of Phytoestrogens in Equine Feeds and Serum. Doctoral dissertation, University of Florida, Gainesville, FL. https://ufdcimages.uflib.ufl.edu/UF/E0/05/17/43/00001/ADKIN_A.pdf
- Dupont, S., A. De Spiegeleer, D. J. X. Liu, L. Lefère, D. A. van Doorn, and M. Hesta. 2016. A commercially available immunoglobulin E-based test for food allergy gives inconsistent results in healthy ponies. Equine Veterinary Journal 48(1): 109–113. https://doi.org/10.1111/evj.12369
- Food Allergen Labeling and Consumer Protection Act of 2004, Pub. L. No. 108-282, Title II, § 203(c), 118 Stat. 905 (2004), codified at 21 U.S.C. § 321(qq)(2)(A).
- National Research Council. 2007. Nutrient Requirements of Horses. 6th rev. ed. Washington, DC: The National Academies Press. Nutrient Requirements of Horses: Sixth Revised Edition 2007
- University of Georgia, College of Agricultural and Environmental Sciences, Department of Poultry Science. n.d. “Antinutritional Factors.” Poultry Nutrition: Soybeans. UGA Extension. Accessed October 2026. https://poultry.caes.uga.edu/extension/poultry-nutrition/soybeans/antinutritional-factors.html