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Friday, April 24, 2026

4 Supplements You Shouldn’t Be Taking for IBS, According to Dietitians

Key points

Irritable bowel syndrome is a common gastrointestinal condition that affects millions.

Just as certain foods can be triggers, some supplements can aggravate symptoms, too.

Avoid high doses of vitamin C, cascara sagrada, and garlic and fiber supplements.

Irritable bowel syndrome (IBS) is a common digestive disorder that affects millions of people worldwide. It’s characterized by symptoms such as abdominal pain, bloating, gas, diarrhea and constipation, which can significantly impact a person’s quality of life. While the exact cause of IBS is still unclear, it’s often linked to a combination of factors like gut sensitivity, diet, stress and lifestyle. Managing IBS can be a challenging and deeply personal process, as what works for one person may not work for another. This has led many to explore a variety of approaches to alleviate their symptoms, with supplements being a popular option.

For those navigating the complex world of IBS, supplements can seem like a quick and easy solution. After all, many promise to target gut health, manage symptoms or restore balance in the digestive system—all factors that can sound very appealing. However, not all supplements are created equal, and some may do more harm than good for those managing IBS. And choosing the right supplements is critical to avoiding potential flare-ups.

This article aims to help you better understand the role of supplements in IBS management by shedding light on the ones dietitians say you might want to avoid. With a clearer perspective, you can make informed choices and focus on strategies that genuinely support your health and well-being.

1. Vitamin C

Vitamin C supplements, especially in high doses, may be problematic for those with IBS, particularly IBS-D (irritable bowel syndrome with diarrhea). “While vitamin C is known for its benefits as an antioxidant and for improving iron absorption, large doses can act as a laxative and significantly worsen diarrhea symptoms,” shares Amanda Godman, M.S., RD, CDN, a registered dietitian.1

Rather than relying on vitamin C supplements, Godman recommends enhancing your antioxidant intake through whole foods. Fresh fruits and vegetables not only provide vitamin C naturally but also offer additional nutrients and fiber. “Particularly, fruits high in soluble fiber (applesauce, ripe bananas, avocado) can be beneficial in helping to tame diarrhea while giving you a dose of vitamin C,” adds Godman.

It’s important to note that research suggests those with IBD (inflammatory bowel disease) may be susceptible to vitamin C deficiency. Proper intake of this nutrient via foods and, in some cases, adequate supplementation under the guidance of a health care provider is essential for maintaining healthy levels.2

2. Prebiotic Fiber Supplements

Prebiotic fiber supplements, such as inulin, may play a beneficial role in nourishing the gut microbiome. But Kaytee Hadley, M.S., RDN, IFMCP, shares that while prebiotic fiber is generally considered good for gut health, it can sometimes backfire in those with IBS.”I caution folks with IBS about taking prebiotic fiber supplements like inulin,” says Hadley. “While prebiotic fiber can be good for the gut microbiome generally speaking, in people with IBS, it may cause gas, abdominal pain and changes in bowel movements.” These side effects can exacerbate the symptoms individuals with IBS are seeking to manage, making it essential to weigh the potential benefits against the risks.

“Supplementing with IBS is not a one-size-fits-all approach, and it’s important to remember that some supplements are great for one person but not for another,” adds Hadley. Research shows that personalizing prebiotic supplementation based on individual needs in people with IBS is important, as some with this condition can tolerate, and even benefit from these supplements, while others may experience the opposite effects. Specifically, the researchers reported that personalized prebiotic and probiotic supplements selected according to individual intestinal microbiota and IBS subtype may alleviate the severity of IBS symptoms.

3. Cascara Sagrada

Cascara sagrada is a natural laxative made from the bark of a tree, often used to help relieve constipation. It works by stimulating the intestines to encourage bowel movements. While it may sound appealing to take it, if you have IBS, cascara sagrada might not be the best option for constipation.

“While it is marketed as a natural remedy for constipation, it can irritate the lining of the gut and worsen symptoms like cramping, diarrhea and bloating, especially for those with IBS-D (diarrhea-predominant IBS),” notes Mascha Davis, M.P.H., RDN, a registered dietitian nutritionist. “Long-term use can also lead to dependency and potentially harm the gut microbiome, making it counterproductive for managing IBS symptoms,” adds Davis.4

4. Garlic

Garlic supplements are widely used for their potential health benefits, as garlic is known for its antibacterial, antiviral and immune-supporting properties.5 These supplements are typically made from concentrated forms of garlic, such as garlic powder, oil or aged garlic extract. They are often marketed to help improve heart health, lower blood pressure and combat infections.

However, garlic supplements can pose a significant problem for individuals with IBS. Garlic is high in FODMAPs, a group of fermentable carbohydrates that are poorly absorbed in the gut. These compounds can lead to symptoms like excessive gas, bloating, abdominal pain and diarrhea in people with IBS.6 Even in supplement form, the concentrated garlic compounds can trigger these digestive issues, making them an unfavorable choice for those managing IBS.

The Bottom Line

Managing IBS can feel overwhelming at times, but it’s important to remember that you are not alone. With the proper knowledge and support, navigating the challenges of this condition becomes much more manageable. While supplements may seem like an easy fix, taking the time to understand their potential positive and negative effects can empower you to make informed decisions that truly benefit your health. Remember, every individual’s experience with IBS is unique, so there’s no one-size-fits-all approach to managing symptoms. Finding what works best for you may take some trial and error, but each step brings you closer to a healthier, more comfortable life.

Ultimately, managing IBS is about more than just finding quick solutions; it’s about adopting strategies that support your overall well-being in the long term. Seeking guidance from qualified health care professionals, relying on evidence-based resources and listening to your body are all key components of effective management.

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Labels: avoid supplements if u r IBS_ Vitamin C, cascara sagrada, Garlic, IBS/ Irritable bowel syndrome, prebiotic fiber supplements

The #1 Habit to Break If You Have IBS, According to Experts

Key Points

Over-restricting your diet can worsen IBS by fueling stress, nutrient gaps and flare-ups.

A short-term elimination diet with guidance helps pinpoint true triggers without overcutting.

Fiber type matters—soluble fiber may ease IBS, while too much insoluble fiber can aggravate it.

Living with irritable bowel syndrome (IBS) can feel overwhelming. The discomfort, unpredictable symptoms and constant worry about triggering a flare can push people toward extreme measures to cope. But some of these well-intentioned habits may do more harm than good. In this article, we’ll highlight the No. 1 habit experts say to break if you have IBS—and share practical tips to better manage your symptoms.

The top habit to break, our experts say, is being overly restrictive with your diet. It’s understandable—when you’re trying to avoid symptoms, cutting out potential trigger foods can feel like the safest choice. But in reality, this approach may backfire and make IBS harder to manage in the long run.

Many people with IBS also fall into the trap of eliminating multiple food groups in an attempt to control their symptoms. While this might provide temporary relief, it can lead to a more sensitive gut, nutritional deficiencies and an overall lower quality of life. Over-restriction can also create a cycle of anxiety and stress around food. That can be particularly problematic for those with IBS, since stress is a well-known trigger for symptoms.

Why Over-Restricting Your Diet Backfires

In some cases, restrictive behavior can lead to conditions like orthorexia, an unhealthy obsession with eating only “clean” or “safe” foods. This not only limits the variety and enjoyment of food but can also exacerbate IBS symptoms due to the lack of necessary nutrients that support gut health.

“Instead, the goal should be to liberalize your diet as much as possible while avoiding or limiting your unique food triggers,” says Roney. Rather than cutting out entire food groups or severely restricting your diet, a more effective approach is to identify specific triggers through a structured short-term elimination diet under the guidance of a health care provider. This involves temporarily removing common trigger foods and then gradually reintroducing them to pinpoint which ones actually cause symptoms. This method allows you to maintain a balanced diet while still managing your IBS.

Another key factor to consider is the role of fiber in your diet. While fiber is essential for digestive health, the amount of fiber you consume can significantly impact your IBS symptoms. So can the type of fiber you eat. For example, insoluble fiber, found in whole grains and some vegetables, can exacerbate symptoms for some people, particularly those prone to constipation. “Soluble fiber from oats, beans, fruits and certain vegetables like broccoli, carrots and green beans can help digestive symptoms,” says Sheila Patterson, RD, CDCES. “After a flare-up, gradually reintroduce fiber by 2 to 3 grams per day and include fiber consistently if you aren't experiencing symptoms.”

What Is Irritable Bowel Syndrome?

IBS is a chronic gastrointestinal disorder that affects the large intestine, impacting millions of people, including about 5% of Americans. It is characterized by a range of symptoms, including abdominal pain, cramping, bloating, gas and changes in bowel habits, such as diarrhea or constipation. The severity of symptoms can vary from person to person and can significantly impact quality of life, making it difficult to eat out, enjoy time with friends and explore new cuisines.

The exact cause of IBS is not fully understood, but it is believed to involve a complex interaction of factors. These include gut-brain communication, gut motility issues, food sensitivities, stress and imbalances in gut bacteria. Unlike inflammatory bowel diseases, such as Crohn’s disease or ulcerative colitis, IBS doesn’t cause visible damage to the intestines, which can make it difficult to diagnose and treat effectively.

While diet is a main contributor to IBS symptoms, it’s not the only one. “There are many other factors that can trigger IBS symptoms like stress, anxiety and poor sleep, so focusing on food alone may not completely alleviate symptoms,” says Bonnie Roney, RD. “Because IBS symptoms can be triggered by various factors, including diet, stress and hormonal changes, managing symptoms often requires a personalized plan.” This is where the challenge begins—especially when it comes to diet.

Tips for Managing IBS

While breaking the habit of overly restrictive eating is crucial, managing IBS involves a multifaceted approach. Here are some additional dietitian-approved strategies to help manage your symptoms more effectively:

Incorporate Stress-Relief Techniques: Stress is a major trigger for IBS, so finding ways to manage it is essential. Practices like mindfulness meditation, deep-breathing exercises, yoga and regular physical activity can help reduce stress and, in turn, alleviate symptoms.
Stay Hydrated: Adequate hydration is important for maintaining regular bowel movements, especially if you’re living with IBS. Drinking enough water throughout the day can help prevent constipation and keep your digestive system functioning smoothly. If you find plain water boring, try infusing it with slices of fruit or herbs for added flavor without added sugar.
Be Mindful of Portions and Meal Timing: Large meals or eating too quickly can trigger IBS symptoms. Try eating smaller, more frequent meals and take time to chew your food thoroughly to reduce the strain on your digestive system.
Seek Professional Support: Navigating IBS can be challenging, but you don’t have to do it alone. Working with a registered dietitian or a gastroenterologist who specializes in IBS can help you develop a personalized management plan that addresses your unique symptoms and needs. These professionals can also provide guidance on safe elimination diets, appropriate fiber intake, and other dietary strategies tailored to your condition.

Monitor and Adjust: IBS is a dynamic condition. So, what works for you at one point in time may change. Keep a food and symptom diary to track how different foods, activities and stressors affect your symptoms. This can help you or a health care provider make informed adjustments to your management plan as needed.

Our Expert Take

Managing IBS requires a balanced approach that prioritizes both your physical and mental well-being. While it might be tempting to try to control symptoms by drastically restricting your diet, this may cause more harm than good. Breaking the habit of being overly restrictive can improve your overall health, reduce stress and help you better manage your IBS symptoms. Focus on a varied, balanced diet and stress management. And seek professional guidance to find what works best for you.