Digestive Health Supplements: What to Look for Before You Buy

"Digestive health supplements" covers a wide range of products: probiotics, fiber supplements, digestive enzymes, herbal formulas and multi-ingredient blends marketed for digestive support. They can differ a great deal in what they contain, how they are meant to be used and how much research stands behind them.

Choosing well means looking past the marketing. Before you buy, it helps to evaluate the ingredients, the label, the available evidence, who is making the claims, and whether the product actually matches what you are hoping to address. This guide walks through each of those steps.

Start With the Ingredient List

Every dietary supplement sold in the United States must carry a Supplement Facts panel. According to the U.S. Food and Drug Administration (opens in a new tab) (FDA), it lists the serving size, the dietary ingredients and the amount of each ingredient per serving. It's the most useful part of the package, so read it before the front-of-bottle marketing.

As you read the label, ask:

• What is in it, exactly? Note each ingredient and its form.
• How much is in a serving, and how many servings does the label recommend per day?
• What is each ingredient there to do? Is its purpose clear, or is it simply listed?
• Is it a "proprietary blend"? Blends may show a total amount rather than the amount of each ingredient, which makes individual ingredients harder to evaluate.

Keep in mind that an ingredient appearing on a label does not, by itself, show that the product will deliver a particular health benefit. What matters is the evidence for that ingredient, in that form and amount, for your purpose.

Don't Assume More Ingredients Means a Better Supplement

A long ingredient list can look impressive, but more ingredients do not automatically make a better product. Each added ingredient is another thing to research, and when many ingredients share a single blend, the amount of each one may be small or undisclosed.

Probiotics are a good example of why the details matter. According to the National Center for Complementary and Integrative Health (opens in a new tab) (NCCIH), different types of probiotics may have different effects. If one specific kind of Lactobacillus helps with a particular problem, that doesn't necessarily mean another kind of Lactobacillus, or a Bifidobacterium, would do the same.

Probiotic labels often list amounts in colony forming units (CFUs). A higher CFU number on its own doesn't tell you a product is more effective. Research findings apply to specific strains, and NCCIH notes that it isn't known how much of a probiotic people would need to take, or who would be most likely to benefit. NCCIH also reports that some probiotic products have been found to contain microorganisms other than those listed on the label.

Probiotics are also often confused with digestive enzymes. Our comparison of digestive enzymes vs. probiotics for bloating explains the difference.

Be Careful With Dramatic Claims

Digestive products are sometimes promoted with sweeping language. These are examples of the kind of phrasing worth evaluating critically. They are not claims we endorse:

• "Fix your gut instantly"
• "Eliminate bloating permanently"
• "Detox your digestive system"

Promises like these are a reason for extra caution. Digestive symptoms rarely have a single cause. The National Institute of Diabetes and Digestive and Kidney Diseases (opens in a new tab) (NIDDK) describes bloating as a feeling of swelling or fullness in the abdomen. It explains that gas symptoms can come from having extra gas in the digestive tract, or from being more sensitive to a normal amount of gas. Everyday factors such as swallowing air and certain foods (opens in a new tab) can also play a role. A single product is unlikely to address every possible cause.

"Detox" claims deserve particular scrutiny. According to NCCIH, research on detox and cleanse programs (opens in a new tab) has generally been of low quality. The FDA and the Federal Trade Commission have taken action against some companies selling detox or cleansing products, including for hidden ingredients and for false claims that the products could treat serious diseases.

It also helps to know how supplements are regulated. The FDA does not approve dietary supplements before they are marketed. Companies are responsible for making sure their claims are truthful and not misleading. Many supplement labels include this required statement: "This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease."

Research the Ingredients — Not Just the Product Name

Searching for a product's name mostly turns up the manufacturer's own pages, advertisements and sales-focused content. To get a clearer picture, research the individual ingredients instead:

• Look up each ingredient in a reliable, independent source, such as NCCIH's Herbs at a Glance (opens in a new tab). It summarizes what the science says about many herbs, along with potential side effects and cautions.
• Notice whether research involved people, rather than only laboratory or animal studies.
• Check whether the research used a similar form and amount to what the product contains.
• Remember that evidence for a single ingredient is not the same as evidence for a finished product that combines many ingredients.

NCCIH also points out that "natural" does not always mean "safe," and that some supplements can interact with medications. That is one more reason to research each ingredient and share what you take with your healthcare providers.

Check Who Is Making the Claims

It matters who is providing the information you are reading:

• Manufacturer information is useful for product-specific details: the ingredient list, directions for use, how the company describes its product, and purchasing terms.
• Independent evidence comes from sources that don't sell the product, such as published research and government health agencies. It is where you look to judge whether a claim is supported.

A manufacturer's description of its own product is not independent scientific evidence, however confidently it is written. On Wellness Buyer Guide, manufacturer statements are labeled as manufacturer claims so you can tell them apart from independent sources. You can read more in our editorial policy.

Compare the Product With Your Actual Goal

"Digestive health" means different things to different people. Someone dealing with occasional bloating after meals may have a different goal from someone focused on regularity, or someone interested in general digestive wellness. A product designed around one of those goals may not be relevant to another.

Before choosing a supplement, it's worth considering the everyday habits that are commonly recommended first, such as eating habits, gradually increasing fiber, hydration and physical activity. We cover these in our guide, What Helps With Bloating and Slow Digestion? 7 Practical Ways to Support Better Digestion.

What About Herbal Digestive Formulas?

Some digestive-support supplements combine several botanical ingredients into a single formula instead of focusing on one ingredient. The same questions apply: what is in it, how much of each ingredient, what evidence exists, and who is making the claims.

One example we've examined is DigestiStart, a supplement whose manufacturer lists a blend of botanical ingredients.

For a closer look at each listed ingredient and what we could verify about it, see DigestiStart Ingredients: What’s in the Formula?

Botanical supplements can interact with medications and are not appropriate for everyone. If you are pregnant, nursing, taking medication or managing a health condition, talk with a qualified healthcare professional before trying any new supplement.

When You Should Talk to a Healthcare Professional

Supplements are not a substitute for a medical evaluation. Talk with a qualified healthcare professional if your digestive symptoms are persistent, severe, worsening or worrying to you, or if they interfere with your daily life. For example, the NIDDK (opens in a new tab) advises seeking medical care right away if constipation occurs along with symptoms such as bleeding from the rectum, blood in the stool, constant abdominal pain, vomiting, fever or losing weight without trying.

It's also a good idea to tell your healthcare providers about any supplements you take, so they can check for possible interactions with your medications or health conditions. This article can't diagnose the cause of your symptoms. Only a healthcare professional who evaluates you can do that.

The Bottom Line

A digestive health supplement is only as useful as the evidence and fit behind it. Before you buy:

• Read the label, including the Supplement Facts panel and serving information.
• Understand the ingredients and how much of each the product contains.
• Evaluate the evidence, looking for human research on the specific ingredients, strains and amounts.
• Distinguish manufacturer claims from independent evidence.
• Consider whether the product matches your actual goal, and whether everyday habits should come first.

Taking a few minutes to research these questions can help you make a more confident, informed decision.