Fiber+ review · Gut health
Momentous Fiber+ Review (2026): Three Fibers in One Scoop, and Who It Suits
Psyllium husk, rice bran and a resistant potato starch, in one tub. We read the label lane by lane, checked what changed since launch, and set out how to start with less bloating.
By Sama Alabed · First published 24 Jun 2026 · Facts checked 7 Nov 2026
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2 scoops6 g fiber3 fiber sources30 servings
The short answer
A thoughtfully built daily fiber: three sources, 6 g a serving, NSF listed, with one small trial behind its prebiotic starch. It tops up a low fiber diet; it does not replace food, and it costs about $1.33 a day.
- In itPsyllium husk 4 g, Solnul resistant potato starch 3.5 g, rice bran hull 2 g. Label
- Fiber6 g per 2 scoops: 2 g soluble, 4 g insoluble. 35 calories (40 in Orange).
- Start1 scoop a day for the first 1 to 2 weeks, then 2. Maker
- SpacingAt least 2 hours away from medicines and iron. Maker
- TestingListed as "Fiber" under Momentous in NSF's Certified for Sport directory (searched 7 Nov 2026).
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What is in two scoops
Three lanes, three jobs
Psyllium husk
4 gSolubleAbsorbs water into a gel that softens stool and helps you feel full. The lane most fiber supplements are built on.
Solnul resistant potato starch
3.5 gPrebioticStarch that escapes digestion and is fermented by gut bacteria in the colon. This is the ingredient with its own clinical trial.
Rice bran hull
2 gInsolubleAdds bulk that helps things move. Momentous pairs it with psyllium for regularity.
Bars show grams of each ingredient in a 2 scoop serving. The label counts 6 g of that as dietary fiber. 6 g is a top up: Momentous itself cites 25 to 38 g a day as the target for adults. Maker
Source data · Fiber+ Pure Cinnamon label, read 7 Nov 2026. Visualized by · samā·says.
Fiber or Fiber+?
What changed since we first reviewed it
24 Feb 2026
Momentous launches Fiber+ as its first "performance fiber". A Momentous image says it was developed with Arnold Schwarzenegger and his Pump Club team. Maker
The name
The tub says Fiber+. Our first review called it "Momentous Fiber", and NSF's directory lists it as "Fiber". We found no separate, older Momentous fiber product.
Since June
A third flavor, Orange, joined Pure Cinnamon and Unflavored. It adds natural orange flavor, citric acid and Reb M. Its label shows the same 6 g of fiber, at 40 calories a serving.
Jan 2026
Light Labs third party test on the product page: 13 substances. Maker
Start slow
How to start with less bloating
3 gfiber
One scoop a day while your gut adjusts. Momentous suggests this for anyone new to fiber supplements.
6 gfiber
Two scoops a day, the full serving, once one scoop sits comfortably.
1 scoop
1 scoop
2 scoops
2 scoops daily
- Stir into a small glass of cold or room temperature water and drink it straight away; it thickens as it stands.
- Smoothies and yogurt work too. Drink enough water through the day.
- Momentous says regularity can change within 12 to 48 hours and gut benefits build over 1 to 4 weeks. Maker
One rule to remember
Keep it two hours away from medicines and iron
Fiber can slow how some medicines and iron are absorbed. Momentous's own directions: take Fiber+ at least 2 hours before or after medications, and not within 2 hours of iron.
The evidence
The starch has a trial; the blend does not
People
75 healthy adults, 4 weeks.
Dose
3.5 g or 7 g of Solnul a day, against a digestible corn starch placebo. Fiber+ uses 3.5 g.
Found
At 3.5 g, more Bifidobacterium and Akkermansia than placebo, and fewer diarrhea and constipation linked bowel movements. The 7 g group was less consistent.
Caveat
Funded by the starch's maker; short; bowel records stopped at 4 weeks.
Bush JR et al. Nutrients 2023;15(7):1582. PubMed 37049425 Study
Fiber in general has a deep record. Dietary fiber intake is strongly associated with better gut health and lower disease risk. Study
NCBI, PMC11671356
Fiber also plays a role in metabolic and cardiovascular health. Study
NCBI, PMC3257631
How much weight it carries: the ingredients are well studied; Fiber+ as a finished blend has not been tested in a trial. Momentous's blood sugar and gut brain claims are the brand's, not ours.
From Sama
Why fiber, and why not everyone needs it
“Fiber is the one I think quietly gets left behind. It matters for digestion, for regularity, and for giving your gut something real to work with.”
“If you are already hitting your fiber consistently through what you eat, save your money and keep doing what is working.”
Sama, from the earlier version of our Momentous hub.
On the taste Firsthand
“I really enjoy Momentous Fiber. The flavor is delicious, and I genuinely look forward to drinking it.”
Sama, November 2026. A taste opinion, not a digestion result: what the fiber itself does is in the evidence above.
Who should skip it
Fiber+ is not for
- People who already eat plenty of fiber from vegetables, fruit, beans and whole grains and are regular.
- Anyone who has trouble swallowing. Psyllium swells with liquid and can cause choking; US labeling rules for over the counter psyllium products say not to take them if swallowing is difficult. 21 CFR 201.319
- Anyone who has had an intestinal blockage or rectal bleeding, unless their doctor agrees. MedlinePlus on psyllium
- People whose medicine timing cannot move around a 2 hour gap.
- Anyone who wants a stimulant laxative. This is a daily fiber, not a quick fix.
Try it
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Quick answers
Frequently asked questions
Is Momentous Fiber the same as Fiber+?
Yes. The product is called Fiber+. Some listings, including NSF's directory and our first review, call it Momentous Fiber.
Is a fiber supplement necessary?
Not always. Most adults eat less fiber than recommended, and a supplement can help close the gap. If your diet already gives you plenty and you are regular, you probably do not need one.
Will Fiber+ cause bloating?
Any new fiber can cause gas or bloating at first. Momentous suggests one scoop a day for the first 1 to 2 weeks, plenty of water, then two scoops.
How long does it take to notice a difference?
Momentous says regularity can change within 12 to 48 hours, with gut benefits building over 1 to 4 weeks of daily use.
When should I take it?
At any time you can keep consistent, at least 2 hours away from medicines and iron. Drink it right away after mixing.
Can I take fiber every day?
Yes, it is designed for daily use. Consistency matters more than timing.
Keep reading
More from our Momentous reviews
Fiber is one lever. For the rest of the system, read Gut Optimization.
For educational purposes only. Nothing here is medical advice; ask a qualified professional before starting any new supplement. As an affiliate, samā·says may earn a commission on qualifying purchases made through links in this post.