03/29/2026
Horse Post of the Day: “Ancient Wisdom vs. Science”
Random Horse Person:
“This gut supplement is LIFE-CHANGING!”
Ingredients: aloe vera powder, marshmallow root, slippery elm bark, peppermint leaf, Yea-Sacc, psyllium husk, and trace amounts of glutamine and threonine.
Concerned Citizen:
“Where is the research behind said product?”
Original Poster:
“Every ingredient has been used for thousands of years for gut healing. History tells us it works. We don’t need peer-reviewed research for everything. Case studies are evidence.”
Me:
So…you essentially brought a knife to a gun fight. Sure. 🔪
Let’s unpack this for a second.
Yes, many herbs and various ingredients have traditional uses. That’s interesting and sometimes a great place to start asking questions. But “people have used it forever” is NOT the same thing as proof that it works in horses, at the dose provided, for the condition claimed.
By that logic, bloodletting should still be the gold standard of medicine because humans did that for a couple thousand years too.
Here’s the other fun part: dose matters. A lot.
Many of these boutique gut supplements sprinkle in ingredients at what nutritionists lovingly refer to as “tag dressing” levels—amounts so small they look impressive on the ingredient list but are unlikely to do much biologically.
For example:
• Psyllium? Useful in horses… when fed at the right dose. Think around 450-500 grams for sand removal from the gut, but at the very least, a few ounces per day.
This supplement – just shy of 600 mg per serving. That’s a half a gram, folks! Whoopity Doo Dah!
• Yeast cultures like Yea-Sacc? There is actually real research behind them for hindgut fermentation. The recommended dosage for Yea-Sacc in horses is generally 10g to 25g per day. This supplement 0.7 grams per serving. Need I say more?!
• Aloe vera powder is the most substantial ingredient in this supplement at 3.5 grams per serving. But here is the deal: the research on aloe vera in horses is just…meh. And none of it looked at using aloe vera powder.
• Amino acids like glutamine and threonine? Important nutrients… but if the label says “trace amounts,” your horse’s hay probably provided more before breakfast.
And while herbs like marshmallow root and slippery elm are often marketed as “gut soothing,” we have very little controlled equine research showing they meaningfully treat ulcers or other GI disease.
This is why peer-reviewed research matters. Not because scientists hate herbs or tradition, but because research answers the annoying but important questions like:
• Does it actually work in horses?
• At what dose?
• For which condition?
• Is it better than doing nothing (or just feeding more forage)?
“Case studies” and anecdotes are where ideas begin.
Controlled research is how we figure out if those ideas survive contact with reality.
Otherwise, every supplement that ever made one horse feel better after a Tuesday full moon becomes “life-changing.”
And the supplement industry would very much like to keep it that way.
