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Does GRL Fiber work? Five grams of inulin in a gummy, and the doses the trials used

Quick answer

Does GRL Fiber work? No trial of the gummy exists, and the brand’s page says its effectiveness has not been confirmed through clinical trials. A serving of three prints 5 g of fiber from chicory root fiber, while the inulin trials in constipation used 12 g a day (a median 4.0 against 3.0 stools a week) and a dose-ranging trial found the difference significant at 15 g and not reported at 5 g. A 2014 meta-analysis found pain and bloating did not improve with inulin. The only rating is the brand’s own, 4.47 from 34 reviews, 20 flagged as perk reviews.

Four rows: a serving of GRL Fiber prints 5 g of fiber; the two inulin trials in constipation used 12 g a day; in the dose-ranging trial the stool frequency difference was significant at 15 g a day and not reported as significant at 5 g.
Source: Micka et al., 2017; Puhlmann et al., 2025; Buddington et al., 2017; GRL Fiber label. Chart by SuppleGut, free to reuse with a link to this page.

GRL Fiber is a chewable fiber gummy from Boujee Hippie, a wellness and apparel brand. A serving is three orange and mixed berry gummies, and the label prints 5 g of dietary fiber from chicory root fiber, with 3 g of added sugar. What sets it apart from the fiber on the next shelf is how the brand frames it: the product page says it helps “decrease bloat,” and the same page carries the brand’s own statement that its effectiveness has not been confirmed through clinical trials. This page sets out what the panel prints, what the trials of chicory inulin used for dose and found, and what the reviews, the price and the refund terms show.

What GRL Fiber is, and what it is not

The Supplement Facts panel gives a serving of three gummies. Per serving it prints 25 calories, 9 g of total carbohydrate, 5 g of dietary fiber (18% of the daily value), 3 g of total sugars, all 3 g of them added sugar (6% of the daily value), and 15 mg of sodium. The bottle front reads 90 gummies, which makes 30 servings at three a day; the servings-per-container line on the panel image is blank, so 30 is arithmetic, not a printed figure. It carries a Supplement Facts panel, not a Drug Facts panel, so it is sold as a dietary supplement and not as an over-the-counter fiber laxative.

The ingredient list reads chicory root fiber, sugar, water, pectin, citric acid, natural flavors, sodium citrate, starch, vegetable juice and turmeric (both for color), organic sunflower oil and organic carnauba wax. Chicory root fiber is the only fiber named, and its amount is not itemized. The product page calls it chicory root fiber (inulin), but the panel has no separate line for inulin, so the most it can contain is the 5 g fiber total. The brand describes the gummy as vegan, gluten free and non-GMO. There is no contains statement or facility statement, and nothing about soy, tree nuts, fish or sesame. No testing laboratory or manufacturer is named; the label image carries only a vendor code.

One difference between the page and the panel: the page’s “What’s Inside” block lists turmeric root powder among the ingredients that make a difference, while on the label turmeric is listed for color, with no amount.

The trial of the product itself

There is none. The brand’s page says so in its own words: the product’s effectiveness “has not been confirmed through clinical trials and/or testing,” and the evidence behind its claimed benefits is limited to anecdotal reports and preliminary laboratory findings. We found no study of the gummy on PubMed or ClinicalTrials.gov. The page also makes claims about appetite, blood sugar and weight management; it cites no study for them, and we found none linking a fiber gummy of this type to those effects.

The gummy replaced an earlier fiber gummy from the same brand, FUPA Flat. The brand’s advertising calls GRL Fiber that product’s “big sister,” and reviewers describe it as a rework with less gas. We did not read a FUPA Flat panel, so whether the formulas differ is not established. FUPA Flat is a different product with its own listing, so its ratings are not carried over here.

The evidence for chicory inulin, and the dose

All of the evidence is for chicory inulin, or inulin-type fructans, as a class, and most of it is at doses well above 5 g. Two placebo-controlled crossover trials in adults with constipation each used 12 g of chicory inulin a day for four weeks. In the first, 44 adults took 4 g three times a day, and median stool frequency was 4.0 a week against 3.0 on placebo (p = 0.038), with softer stools; the trial was funded in part by BENEO, an inulin producer (Micka et al., 2017). In the second, 39 adults with functional constipation had larger changes in stool frequency, abdominal symptoms and quality of life than on placebo; the authors report a carry-over effect between periods and say that the first-period analysis supported the result, and the author group includes a chicory inulin producer, Sensus (Puhlmann et al., 2025). A serving of GRL Fiber has 5 g of fiber, 42% of that 12 g.

The nearest dose-ranging trial tested a short-chain inulin-type fructan, oligofructose, in 97 healthy adults with three or fewer bowel movements a week and low fiber intake. Each person had four weeks at each of 5, 10 and 15 g a day. Stool frequency rose on oligofructose against maltodextrin, and the abstract reports the difference as significant at 15 g a day (p = 0.023); it reports no significant difference at 5 g, the dose closest to the label. The authors are from BENEO (Buddington et al., 2017).

Bloating: the claim and the meta-analysis

The brand’s headline claim is that GRL Fiber helps “decrease bloat.” A 2014 meta-analysis of five randomized trials in 252 people found that inulin raised stool frequency (standardized mean difference 0.69, 95% CI 0.04 to 1.34) and stool consistency (1.07, 0.70 to 1.45) and shortened transit time. On the claim itself, its conclusion is plain: pain and bloating do not improve with inulin intake (Collado Yurrita et al., 2014).

Fermentation is also the source of gas. In a double-blind crossover study of 84 healthy volunteers who took 5 to 20 g a day of inulin-type fructans, digestive symptoms (flatulence, rumbling, bloating, cramps) rose mildly with every product, reaching statistical significance for only one product at 20 g a day, and all were rated well tolerated (Bruhwyler et al., 2009). The label directions carry the same logic: reduce the daily dosage if minor gas or bloating occurs.

Set against those figures, a serving prints 5 g of fiber, below the 12 g of the two constipation trials and at the dose where the one dose-ranging trial reported no significant difference. No trial tested this formula, so the trials show neither that the gummies work nor that they do not. Reaching 12 g from this label would take more than two servings, which is more than twice the printed direction and about $2.24 a day.

How to take GRL Fiber

The directions: adults chew three gummies a day, or as recommended by a healthcare professional, and chew completely before swallowing. The three can be taken together as one serving. The page gives no instruction about food or water. The trials ran four weeks per period, so a month is the shortest fair test, and one reviewer on the brand page writes that a 30-day commitment is the plan. Two reviewers say they cut from three gummies to two because of gas, which is what the label allows.

Side effects and who should check first

The recurring effect in both the trials and the reviews is gas and bloating at the full dose. The label image has no readable warning panel. The page says to talk with a healthcare provider before using supplements, especially with a medical condition or medication, and the brand FAQ repeats that for medications and medical conditions. We found no statement on pregnancy, breastfeeding or age. Each serving also has 3 g of added sugar.

What the reviews say

The only product rating for GRL Fiber is the brand’s own. Its page shows 4.47 from 34 reviews (26 five-star, 2 four-star, 4 three-star, none two-star, 2 one-star), all labeled verified buyers, in a widget the brand hosts. Twenty of the 34 carry the flag that the customer received a perk in exchange for an honest review; the flag does not say which kind of perk. GRL Fiber has no Amazon listing, and there is no Trustpilot profile for the brand. The earlier FUPA Flat is on Amazon at 4.2 from 227 ratings, but that is a different product and its score is not GRL Fiber’s.

The recurring praise, by our rough count: flavor (about 9 of 34), less gas than FUPA Flat (about 6), and regularity or less bloating (about 8). The recurring complaints: no effect yet or more bloating (about 3), gas at three gummies a day (2), and slow delivery, an unsealed bottle or a smaller bottle than the one it replaced (about 5). We did not read Reddit, which was not available to us.

The Better Business Bureau profile for Boujee Hippie Company is separate from product reviews and covers the whole company: an F rating, not accredited, six complaints in three years, one in the last twelve months. Most complaints are about orders that did not arrive or arrived late and refunds refused under the final-sale policy; five of the six are unanswered. The BBB gives as reasons for the rating advertising issues it found and failure to respond to five complaints. The two customer reviews there, both one-star, are about apparel orders.

The subscription and refund terms

The brand’s return policy states that all items are final sale, non-refundable, with no exchanges, that it does not refund packages that track as delivered, and that issues reported after 30 days will not be honored. The shipping page asks for seven business days of processing plus four to five days for delivery, and says lost or stolen packages without the optional paid Order Protection are not refunded or replaced. A shipping charge was not shown before checkout. No money-back guarantee was found.

A Subscribe & Save plan takes 15% off, managed through Recharge: to cancel, the FAQ says to use the most recent subscription email from Recharge or contact the brand. The bottle can also be bought once, without a subscription, on the same page. The page also offers payment with HSA or FSA funds through Truemed, and Afterpay.

Who GRL Fiber is for

Where the grams of fiber matter, other formats print them. NOW Foods inulin powder is single-ingredient chicory inulin, the fiber the 12 g trials used. Black Girl Vitamins Fiber is another 5 g fiber gummy with its own set of terms and reviews, covered in its own guide. Metamucil Fiber Gummies are a gummy from a psyllium brand. For psyllium itself, see the psyllium husk vs Metamucil comparison and the ColonBroom guide, and the quiz starts from symptoms instead of a product.

Cost

A 90-gummy bottle is $27.99 one time, or $0.93 a day at three gummies a day (about $0.31 a gummy). With the 15% subscription it is $23.79 a delivery, or $0.79 a day. The brand site is the only place we found it sold. At the 12 g a day used in the constipation trials, the same gummies would cost about $2.24 a day.

The products in this catalog

fiber Boujee Hippie GRL Fiber A chicory root fiber gummy taken three a day for bloating and regularity, with 5 g of fiber and 3 g of added sugar per serving.
fiber Black Girl Vitamins Fiber Gummies A once-a-day, three-gummy fiber supplement with 5 g of fiber and 3 g of added sugar per serving, from chicory root or tapioca fiber and pectin. Buy it at Amazon$0.90 a day
fiber Metamucil Fiber Gummies, No Sugar Added A chewable daily fiber gummy — note this exact formula contains no psyllium. Buy it at iHerb$0.97 a day
prebiotic NOW Foods Inulin Prebiotic Pure Powder A cheap, single-ingredient chicory fiber with constipation trials behind it and a well-earned reputation for gas. Buy it at iHerb$0.16 a day

Common questions

Does GRL Fiber work?

No trial of this gummy exists, and the brand’s page says its effectiveness has not been confirmed through clinical trials. Trials of chicory inulin at 12 g a day found more bowel movements than placebo (a median 4.0 versus 3.0 a week in 44 adults), while the label gives 5 g of fiber for three gummies. The brand’s page shows 4.47 from 34 reviews, 20 of them flagged as written in exchange for a perk.

Does GRL Fiber help with bloating?

The brand says it helps “decrease bloat.” A 2014 meta-analysis of five inulin trials in 252 people found that stool frequency and consistency improved but that pain and bloating did not. A few reviewers say it left them bloated or gassy, and the label says to reduce the dose if gas or bloating occurs.

What fiber is in GRL Fiber, and how much sugar does it have?

Three gummies print 5 g of dietary fiber, with chicory root fiber as the only fiber named and no amount itemized. They also have 3 g of total sugars, all of it added sugar (6% of the daily value), 9 g of carbohydrate and 25 calories. The panel has no separate line for inulin.

What are GRL Fiber’s side effects?

The label says to reduce the dose if minor gas or bloating occurs, and two of 34 brand-page reviewers cut from three gummies to two for less gas. Inulin tolerance trials report mild dose-related gas, rumbling and bloating. The page tells anyone with a medical condition or taking medication to talk with a healthcare provider first.

GRL Fiber vs FUPA Flat: what is the difference?

GRL Fiber replaced FUPA Flat, and the brand’s advertising calls it the earlier gummy’s “big sister.” Reviewers say the gas is reduced, but no FUPA Flat panel was compared, so a formula change is not established. FUPA Flat is on Amazon at 4.2 from 227 ratings; GRL Fiber has no Amazon listing. See the Black Girl Vitamins fiber guide for another 5 g fiber gummy.

How much does GRL Fiber cost?

A 90-gummy bottle is $27.99, about $0.93 a day at three gummies. The 15% subscription is $23.79 a delivery, about $0.79 a day. The store lists seven business days of processing plus four to five days in transit, and a shipping charge was not shown before checkout.

Can you get a refund on GRL Fiber?

The brand’s return policy says all items are final sale, with no refunds or exchanges, and that packages tracked as delivered are not refunded. Issues reported after 30 days will not be honored. The company has an F rating at the Better Business Bureau with six complaints in three years, mostly orders that did not arrive.

Sources

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