4 Supplements You Shouldn’t Be Taking for IBS

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, registered dietitian.

Rather than relying on vitamin C supplements, Goodman 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 Goodman. 

It is important to note that data suggests those with IBD (irritable 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 healthcare provider is essential for maintaining healthy levels.

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, 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. Garlic

Garlic supplements are widely used for their potential health benefits, as garlic is known for its antibacterial, antiviral and immune-supporting properties. 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. 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 healthcare professionals, relying on evidence-based resources and listening to your body are all key components of effective management.