Physician's Choice
Is There a Fiber Supplement for Regularity That Doesn't Cause Gas?
Some fiber types make much less gas than others. Gut bacteria ferment some fibers fast, which makes more gas, and others slowly or hardly at all. In lab tests, inulin, a fiber that can come from chicory root, made more gas than psyllium or methylcellulose. Whatever the fiber, add it slowly, and take psyllium with at least 8 ounces of liquid per serving.
- Psyllium Husk Fiber: 2 g of soluble fiber per 5 capsules, which hold 2.6 g of psyllium husk.
- Easy Mix Fiber: 6 g of soluble fiber per heaping spoonful (6.7 g) of soluble corn fiber and guar fiber.
- Fiber Gummies: 5 g of fiber per 2 gummies, with chicory root fiber listed first.
By the Physician's Choice Team. Updated October 9, 2026. Product facts are from the Psyllium Husk Fiber, Easy Mix Fiber and Fiber Gummies labels and product pages.
Why some fiber causes gas
Your stomach and small intestine do not fully digest some carbohydrates, including fiber. In the large intestine, bacteria break them down and make gas, the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) explains. NIDDK also notes that some people have more gas when they take in too much fiber.
How much gas a fiber makes depends on how fast those bacteria ferment it. A 2021 lab study of 15 fibers found three patterns over 4 hours: rapid gas, mild gas, and gas no higher than the blank control.
Soluble or insoluble does not settle it. Inulin and psyllium are both soluble fibers, yet in a 2010 lab model of the colon, inulin made significantly more hydrogen and total gas than psyllium.
Fiber types compared by how much gas they make
Lab studies ferment fiber with stool bacteria outside the body. They show how fast a fiber breaks down, not how you will feel.
| Fiber | Gas in lab studies | What human studies found |
|---|---|---|
| Inulin and other fructans | Rapid: 60 ml of gas or more per gram in 4 hours (So 2021). More hydrogen and total gas than psyllium or wheat dextrin (Timm 2010). | In 26 healthy adults given single doses, both chicory inulin fibers tended to raise gut symptoms mildly, most often flatulence, then bloating. Up to 10 g of native inulin and up to 5 g of oligofructose, a shorter-chain form, were still called well tolerated; a 10 g dose of oligofructose substantially increased symptoms (Bonnema 2010). |
| Wheat dextrin | Less hydrogen and total gas than inulin (Timm 2010). | Not covered here. |
| Partially hydrolyzed guar gum | Mild: 30 to 60 ml of gas per gram in 4 hours (So 2021). | Not covered here. |
| Psyllium husk | Less hydrogen and total gas than inulin (Timm 2010). | No more gas symptoms than placebo at 3.4 g twice a day, in people who believed fiber gave them gas (Zumarraga 1997). With 20 g of inulin, 20 g of psyllium lowered breath hydrogen in the first 6 hours, not over 24 hours, in 17 healthy adults (Alhasani 2025). |
| Methylcellulose | Minimal: no more gas than the blank control (So 2021). | No more gas symptoms than placebo at 2 g twice a day, in the same trial (Zumarraga 1997). |
| Acacia gum | Minimal: no more gas than the blank control (So 2021). | Not covered here. |
Our products: Psyllium Husk Fiber is psyllium husk, and Fiber Gummies list chicory root fiber first. Easy Mix Fiber has no row: these studies did not report on soluble corn fiber, and the guar row covers one form, partially hydrolyzed guar gum.
Inulin and chicory root fiber
Our 60 Billion Probiotic and Digestive Enzymes contain inulin, and our Fiber Gummies contain chicory root fiber; gut bacteria break down fibers like these, which can cause gas.
On a Supplement Facts label, inulin can count as fiber. The FDA intends to propose adding inulin and inulin-type fructans to its definition of dietary fiber. Until then, it lets makers count them in the dietary fiber amount on Nutrition and Supplement Facts labels. Psyllium husk, guar gum, pectin and cellulose are already in the definition.
How to add fiber with less discomfort
Adults get 25 to 38 grams of fiber per day, though exact targets depend on age and sex.
- Go slowly. NIDDK advises adding fiber a little at a time so your body gets used to the change. MedlinePlus says a lot of fiber in a short time can cause gas, bloating and cramps, and suggests adding fiber gradually over a few weeks.
- Drink enough. Drink plenty of water and other liquids when you take a fiber supplement to help keep things moving.
- Give psyllium liquid every time. MedlinePlus says to drink at least 8 ounces (240 milliliters) of liquid each time you take psyllium. Our Psyllium Husk Fiber directions add: swallow the capsules one at a time, start with one serving a day if you are new to fiber, and do not take it if you have difficulty swallowing.
- Ease into powders. The Easy Mix Fiber product page suggests that people new to fiber start slowly and work up to a full daily serving.
When to talk to a doctor
- Talk to your doctor if gas or bloating bothers you, changes suddenly, or comes with abdominal pain, constipation, diarrhea or weight loss. This follows NIDDK's guidance on gas.
- If constipation does not get better with changes to what you eat and drink, talk to your doctor.
- If you take psyllium, MedlinePlus says to call your doctor right away if you have trouble breathing, stomach pain, trouble swallowing, a skin rash, itching, nausea or vomiting.
Physician's Choice fiber products
Physician's Choice Fiber Gummies, Easy Mix Fiber and Psyllium Husk Fiber are made to support regularity and help with occasional constipation.‡ Each one uses a different fiber.
| Psyllium Husk Fiber | Easy Mix Fiber | Fiber Gummies | |
|---|---|---|---|
| Fiber listed | Psyllium husk, 2.6 g | Soluble corn fiber and guar fiber, in a 6.7 g blend | Chicory root fiber first; pectin and agar agar also listed |
| Dietary fiber per serving | 2 g, all soluble | 6 g, all soluble | 5 g |
| Serving size | 5 capsules | 1 heaping spoonful (6.7 g) | 2 gummies |
| Form | Capsules | Unflavored powder | Gummies |
| Directions | Swallow one capsule at a time with at least 8 oz of liquid per serving | Mix into 8 oz of a hot or cold drink | Adults chew 2 gummies daily |
If chicory root fiber or inulin has given you gas before, compare the labels before you buy. Our Return and Refund Policy offers a 60-day return window if you are unsatisfied.
Questions shoppers ask
Can a fiber supplement help with occasional constipation?
Physician's Choice Fiber Gummies, Easy Mix Fiber and Psyllium Husk Fiber are made to support regularity and help with occasional constipation.‡ Drink plenty of water and other liquids when you take a fiber supplement to help keep things moving. If constipation does not get better with changes to what you eat and drink, talk to your doctor.
Does fiber cause gas?
It can. Bacteria in your large intestine break down fiber that your stomach and small intestine do not fully digest, and that makes gas. NIDDK notes that some people have more gas when they take in too much fiber. How much gas you get also depends on the fiber type and how fast you add it.
Which fiber supplement is least likely to cause gas?
It depends on the fiber. In lab studies, methylcellulose and acacia gum made little or no gas, and psyllium made less gas than inulin. In a 1997 trial of people who believed fiber gave them gas, psyllium and methylcellulose caused no more gas symptoms than a placebo. Inulin and other fructans ferment fast.
Soluble or insoluble fiber: which causes less gas?
That label alone does not tell you. Soluble fiber attracts water, and insoluble fiber does not dissolve and adds bulk to stool. Inulin and psyllium are both soluble, yet in a 2010 lab model inulin made significantly more gas. For gas, how fast a fiber ferments tells you more. Our Journal covers the two groups in Soluble vs. Insoluble Fiber.
Do fiber gummies cause gas?
They can. Our 60 Billion Probiotic and Digestive Enzymes contain inulin, and our Fiber Gummies contain chicory root fiber; gut bacteria break down fibers like these, which can cause gas. Also check the sweetener. NIDDK lists sweeteners ending in -ol, such as sorbitol, xylitol and maltitol, among those that may lead to extra gas. The Fiber Gummies label lists none.
‡These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Sources: NIDDK, gas symptoms and causes, eating for gas and eating for constipation. MedlinePlus, Dietary fiber and Psyllium. FDA, Questions and Answers on Dietary Fiber. The PubMed studies linked in the table. Product facts: Physician's Choice labels and product pages.