MiraFiber gummies review: how they compare with Metamucil and tapioca-fiber gummies

MiraFiber sits next to MiraLAX on the shelf. Same maker, similar name. So it is easy to think they do the same job.

They don't. One is a fiber supplement. The other is a laxative drug.

We read the MiraFiber gummy label line by line. Then we checked the research on its fiber. Here is what we found, including where MiraFiber beats our own gummy.

What fiber is in MiraFiber gummies?

Inulin, and only inulin. Four gummies give 8 grams.

That comes from the label in the NIH Dietary Supplement Label Database. It lists 8 grams of dietary fiber, 29% of the Daily Value, and all 8 grams are soluble. The fiber line names inulin as a powder and a syrup.

Inulin is a chain of fructose sugars your small intestine can't break down. It reaches your colon whole. There, gut bacteria ferment it. That is why it is called a prebiotic. Most commercial inulin comes from chicory root. For a food-based look at the same fiber, see our guide to Jerusalem artichoke inulin.

Label line	MiraFiber Gummies
Serving	4 gummies, once a day
Fiber	8 g inulin (29% DV), all soluble
Calories	30
Added sugar	1 g
Sweetener	Monk fruit extract, fruit and vegetable juice concentrates
Vitamins and minerals	Niacin 40 mg (250% DV), vitamin B6 4 mg (235% DV), vitamin B12 10 mcg (417% DV), pantothenic acid 5 mg (100% DV), vitamin E 13.6 mg (91% DV), chromium 120 mcg (343% DV)
Gel base	Gelatin
Bottle	72 gummies, 18 days at the full dose
Age	Adults only

The label in the database carries a 2022 copyright and was entered in May 2024. Formulas change, so read the bottle in your hand.

Is MiraFiber the same as MiraLAX?

No. Bayer makes both, but they work in different ways.

MiraLAX is an over-the-counter drug. Its FDA drug label lists one active ingredient, 17 grams of polyethylene glycol 3350. Its stated purpose is "osmotic laxative." It pulls water into the stool and "generally produces a bowel movement in 1 to 3 days."

MiraFiber is a dietary supplement. It has no active drug ingredient. It adds fiber to your day, which supports regularity over time. It is not built for fast relief.

One more twist. The MiraFIBER powder is not inulin. Its sugar-free label lists 2 grams of methylcellulose, the same fiber type as Citrucel. So "MiraFiber" can mean two different fibers, depending on the format.

Read more in our guide to fiber vs laxatives.

Does inulin help with regularity?

Yes, in at least one good trial, at a higher dose than MiraFiber gives.

In a 2017 randomized, placebo-controlled trial, 44 healthy adults with constipation took 12 grams of chicory inulin a day for 4 weeks. Stool frequency rose from a median of 3 to 4 a week, compared with placebo.

MiraFiber gives 8 grams. That is two thirds of the trial dose. We could find no trial of the MiraFiber gummy itself.

The bigger picture fits. A 2022 meta-analysis of 16 trials in chronic constipation found fiber helped most at doses above 10 grams a day, taken for at least 4 weeks. Psyllium had the strongest results. No gummy on the shelf reaches 10 grams in one serving, ours included.

Do MiraFiber gummies cause gas?

They can. Gas is the most common side effect of inulin, and Bayer's own directions say to cut back if it happens.

The label tells you to reduce the daily serving if "gas, bloating, stomach upset, or any other gastrointestinal effects occur." That is honest advice.

The best dose guide is a 2010 trial of 26 healthy adults in the Journal of the American Dietetic Association. It tested native inulin at 5 and 10 grams. Gas was the top complaint. The authors concluded: "Doses up to 10 g/day of native inulin and up to 5 g/day of oligofructose were well-tolerated in healthy, young adults."

So 8 grams sits under the line that went well for healthy people. If you have IBS, it is a different story.

In a 2022 MRI trial in Gut, 19 adults with IBS drank 20 grams of inulin. It caused the biggest rise in colon gas of any drink tested. Adding psyllium cut that gas. The ACG's 2021 IBS guideline suggests a limited trial of a low-FODMAP diet, and inulin is one of the fructans that diet limits.

If a fiber gummy has left you gassy before, you didn't do anything wrong. You gave your gut bacteria new fuel faster than they were used to. Start with 1 or 2 gummies, build up over 1 to 2 weeks, and drink water.

How do MiraFiber gummies compare with Metamucil?

MiraFiber gives more fiber. Metamucil's gummy has no added sugar. Neither gummy is psyllium.

That last part trips people up. Metamucil is famous for psyllium powder. But its fiber gummy label lists 5 grams of fiber per serving from inulin and Fibersol, a soluble corn fiber. It is sweetened with xylitol, a sugar alcohol, and shows 0 grams of added sugar.

• MiraFiber: 8 g of inulin, 1 g added sugar, monk fruit, gelatin, plus B vitamins and chromium.
• Metamucil gummies: 5 g of inulin and corn fiber, 0 g added sugar, xylitol, pectin.

Both lean on inulin, so both can cause gas. Xylitol can add to it in some people. If you want the fiber with the best regularity record, that is psyllium powder, not either gummy. Our Metamucil vs Olly vs Vitafusion roundup compares more gummy labels.

How does MiraFiber compare with a tapioca-fiber gummy?

MiraFiber has more fiber and less sugar. Seya, our tapioca-fiber gummy, is vegan and skips the vitamin megadose.

Label line	MiraFiber Gummies	Seya Full Fiber
Serving	4 gummies	3 gummies
Fiber	8 g (29% DV)	About 6 g (21% DV)
Fiber source	Inulin	Resistant tapioca fiber 4,500 mg, prebiotic soluble fiber 950 mg, cellulose 200 mg
Added sugar	1 g	3 g
Extras	B vitamins, vitamin E, chromium	Magnesium 80 mg, ginger root 100 mg, Irish moss 100 mg
Gel base	Gelatin	Carrageenan
Diet label	Not vegan	Vegan
Bottle	72 gummies, 18 days	60 gummies, 20 days

Seya facts come from our product page, read in November 2026.

Does tapioca fiber cause less gas than inulin? We don't know. We found no head-to-head trial, so we won't claim it. Resistant tapioca fiber ferments too, and our own product page warns week one can feel bumpy. Learn more in our guide to resistant tapioca starch.

Who should think twice about MiraFiber?

Four groups should read the label closely first.

• People who already take a B complex or a multivitamin. MiraFiber adds 250% of the Daily Value for niacin and over 400% for B12. Add up what you take.
• Vegans and vegetarians. The gel is gelatin, which comes from animals.
• People with IBS or a known fructan problem. Inulin is a fructan. Try a small dose, or ask your doctor.
• People who take daily medicine, or are pregnant or nursing. The label says to ask a health professional first. Fiber can change how some drugs absorb. See our guide to fiber and medications.

Will any fiber gummy close your fiber gap?

No. Gummies are top-ups, not a fix.

The Daily Value for fiber is 28 grams, set in 21 CFR 101.9. MiraFiber covers about 29% of that. Seya covers about 21%. The rest has to come from food.

We grade our own evidence a C for this reason. About 6 grams supports regularity. That is the claim, and we stop there. Use our guide to how much fiber women need per day to size your gap. Our fiber gummy cost guide runs the price math across brands.

Which one should you choose?

Match the label to your goal.

• Pick MiraFiber if you want the most fiber in a gummy, low sugar, and you don't mind gelatin or extra B vitamins.
• Pick Metamucil gummies if zero added sugar matters most and xylitol sits fine with you.
• Pick Seya Full Fiber if you want a vegan gummy without a vitamin megadose, with magnesium and ginger root instead.
• Pick psyllium powder if regularity is your only goal and you can handle a drink.
• Pick MiraLAX, after asking your doctor, if you need relief from constipation in days, not weeks. That is a drug, not a fiber.

Comparing more brands? See Seya vs Metamucil fiber gummies and our list of the best fiber gummies for women. A Seya creatine gummy is coming January 2027. It is not on sale yet.

Frequently asked questions

Is MiraFiber the same as MiraLAX?

No. Bayer makes both, but MiraLAX is an over-the-counter osmotic laxative drug with 17 grams of polyethylene glycol 3350 per dose. MiraFiber gummies are a dietary supplement with 8 grams of inulin fiber. MiraLAX is for relief of occasional constipation. MiraFiber adds daily fiber to support regularity.

What fiber is in MiraFiber gummies?

Inulin. Four gummies give 8 grams of fiber, all of it soluble inulin, per the NIH label database. The gummies also add niacin, vitamin B6, vitamin B12, pantothenic acid, vitamin E, and chromium. The MiraFIBER powder is different: it uses methylcellulose.

Do MiraFiber gummies cause gas?

They can. Gas is the most common side effect of inulin, and the label says to cut the serving if gas or bloating occurs. A 2010 trial found up to 10 grams of inulin a day was well tolerated by healthy adults, and MiraFiber gives 8 grams. People with IBS may react more strongly.

How do MiraFiber gummies compare with Metamucil?

MiraFiber gives 8 grams of inulin with 1 gram of added sugar. Metamucil Fiber Gummies give 5 grams of inulin and soluble corn fiber per serving, sweetened with xylitol and with no added sugar. Neither gummy contains psyllium, the fiber in Metamucil's powder.

Are MiraFiber gummies vegan?

No. The label lists gelatin and white beeswax, which both come from animals. If you need a vegan fiber gummy, look for one set with pectin, agar, or carrageenan instead.

This is education, not medical advice. If you have a gut condition or a sudden change in bowel habits, talk to your clinician before you add fiber.

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.

Written and reviewed by the Seya Health Editorial Team. Every health claim on this page is sourced to primary research or a government source. Labels were checked on November 3, 2026. MiraFiber, MiraLAX, and Metamucil are trademarks of their owners. Seya is not affiliated with Bayer or Procter & Gamble.