If you've been living with unpredictable diarrhea and daily bloating — no matter how carefully you eat or how many diets you try — a leading neurogastroenterologist says you're not alone. And the cause probably isn't what you've been told.

"Most of my patients come to me exhausted and feeling dismissed," explains Dr. Sarah Mitchell, a neurogastroenterologist with over two decades of clinical experience. "They've been told it's just IBS. Try a low-FODMAP diet. Manage your stress. But nothing works, because they're being treated for the wrong thing entirely."

According to Dr. Mitchell, the hidden cause behind stubborn diarrhea and bloating in so many adults isn't a "sensitive gut," a lack of willpower, or stress. It's something far more concrete — and far more treatable.

The picture is stark. Tens of millions of adults are living with what they've been told is irritable bowel syndrome. But here's what most of them are never told: a large subset of people diagnosed with IBS — especially the diarrhea type that doesn't respond to diet or stress advice — actually have SIBO, small intestinal bacterial overgrowth. It's one of the most common misdiagnoses in all of gastroenterology.

And the reason it gets missed is almost absurd: most people are sent to gastroenterologists who don't specialize in motility, so the right test is never even ordered. Years go by — often six, eight, or more — while sufferers are reassured they're "normal."

"What most people don't realize," Dr. Mitchell explains, "is that this isn't in your head. When bacteria overgrow in the small intestine, they ferment your food too early and produce hydrogen gas. That gas physically speeds up your gut motility and pulls water into your intestines — which is exactly why the stool is loose, watery and urgent, with no warning."

But her most important point has nothing to do with diet or stress. It has to do with what's actually happening higher up in your gut.

"Over the past decade, our understanding of these symptoms has fundamentally changed," says Dr. Mitchell. "We now know that an overgrown, inflamed small intestine can scramble the signals that regulate your gut — making it nearly impossible to have a normal bowel movement, regardless of what you eat."

She explains that when the small intestine is overrun with bacteria, the gut lining becomes inflamed and damaged. The result is malabsorption — the gut can no longer properly break down and absorb what you put into it. Which is why, she says, so many sufferers find that nothing they swallow ever seems to work.

"Think of it this way," Dr. Mitchell tells her patients. "If your small intestine is overrun and inflamed, you can't absorb a thing — not your food, not your supplements, not your medications. You have to address the overgrowth first. Everything else is a band-aid."

This insight led her to focus on an approach that targets the root cause — not just the symptoms — of chronic diarrhea and bloating.

Before settling on what she now recommends to her patients, Dr. Mitchell spent years watching them cycle through one failed approach after another:

Low-FODMAP and elimination diets — They can take the edge off for some, but they're brutal to sustain and they never touch the overgrowth itself. Patients end up with a shrinking list of "safe foods" and a life built around what they can't eat.

Imodium and anti-diarrheals — These only slow the gut down. If your food isn't being digested properly in the first place, slowing things further doesn't stop the urgency — it just delays it. Worse, Imodium builds tolerance, so patients keep needing higher doses just to function. A plaster over a wound that's still bleeding underneath.

Rifaximin (the standard antibiotic) — It can clear the overgrowth temporarily, but it kills bacteria indiscriminately, good and bad, and has a notoriously high relapse rate. Patients feel better for a few weeks, then it comes roaring back.

Fiber supplements — Frequently recommended, frequently a disaster. As many sufferers put it, more fiber would murder them — it often makes the bloating and urgency dramatically worse.

Pelvic floor exercises and stress management — Endlessly suggested, and for this kind of bacterially-driven diarrhea, they make almost no difference at all.

Dr. Mitchell's focus narrowed when she began investigating natural compounds known for targeting bacterial overgrowth at the source. Her work led her to a research-backed combination built around one of nature's most studied antimicrobials — designed to work with a damaged gut instead of fighting it.

"What caught my attention," she explains, "was the research on carvacrol, the active compound in oil of oregano. It has a real, measurable ability to target the kind of bacterial overgrowth we see in the small intestine — without the scorched-earth effect of antibiotics."

But oregano oil was only one piece. Dr. Mitchell found that pairing it with compounds that soothe the inflamed gut lining and correct the deficiencies left behind by malabsorption made the difference between brief relief and lasting recovery.

After narrowing her search, Dr. Mitchell identified a product that combines these research-backed ingredients in a single, convenient form: Oil of Oregano by Nutrition Therapy.

"What impressed me about Oil of Oregano," says Dr. Mitchell, "is that it's built on ingredients with real published support — and that it's delivered as drops. That matters more than people think. A damaged, overgrown small intestine can't reliably break down tablets and capsules. A liquid absorbs directly, so it actually reaches the problem."

The formula is built around:

These are rounded out with a few complementary supporting compounds, all delivered as easy daily drops you take under the tongue or in a little water — no pills for a struggling gut to break down.

Dr. Mitchell explains why this approach succeeds where diets and anti-diarrheals fail: "Instead of masking one symptom at a time, you're addressing the cause and giving your gut the chance to work properly again."

"I've tried supplements before and they never work."

Dr. Mitchell responds: "There's a good reason for that. If you have SIBO, your small intestine is too inflamed and overrun to properly absorb a tablet or capsule — so it never gets the chance to work. Oil of Oregano is a liquid that absorbs directly, and it targets the overgrowth that's actually causing your symptoms, rather than just slowing your gut down."

"Will it just stop the diarrhea temporarily, like Imodium?"

"No — that's the key difference. Anti-diarrheals only slow the gut, and they build tolerance. This works at the root by clearing the overgrowth, so the goal is for your gut to start regulating itself again rather than depending on a daily band-aid."

"Is it safe with my medications?"

"Oil of Oregano is a natural formula. That said, I always advise my patients to check with their own doctor before starting anything new, particularly if they're on prescription medication."

"How long before I see results?"

"Many of my patients notice reduced bloating and urgency within the first week. More consistent, formed bowel movements typically follow over the next few weeks. I recommend committing to a full course — which is exactly why the 60-day money-back guarantee matters so much."

"What's the routine?"

"Just 2 dropperfuls daily. Most patients find it easy to stick to — under the tongue or in a little water, once a day."

Oil of Oregano normally retails at $39.99 per bottle. However, the manufacturer is currently running a promotional offer — up to 60% off, bringing the price as low as $16 per bottle with the bundle discount — to help as many people as possible address the real cause of their symptoms.