Fiber
Psyllium husk
4.2 (1064 owner comments)
RegularityStool form
“Neither psyllium nor anything else should be a sole source of fiber for anyone.”
What owners report →Medical disclaimer: GutVerdict summarizes what people say about supplements on Reddit. It is not medical advice, and nothing here is meant to diagnose, treat, cure, or prevent any disease. These statements have not been evaluated by the Food and Drug Administration. Talk to your doctor or pharmacist before starting a supplement, especially if you are pregnant, take medicines, or have a medical condition. New, severe or worsening symptoms (such as blood in the stool, weight loss, fever, or night-time symptoms) need a doctor, not a supplement. Full disclaimer.
Fiber · powder
PHGG (Sunfiber): What People With IBS Report on Reddit
Illustration, not a product photo.
Partially hydrolyzed guar gum, a low-viscosity soluble fiber sold under the Sunfiber name.
3.9 GutVerdict score
507 owner comments (202 with a clear rating) from r/SIBO, r/Microbiome, r/IBS, r/Constipation, r/Supplements, November 2025 to October 2026. Top 25% of the 36 rated supplements.
Owner sentiment3.7
Recommendations3.4
Tolerability4.7
ValueNot rated
Value is not rated: the example products differ too much in dose to compare cost fairly. How we score.
The short version
PHGG (Sunfiber) is rated about average among the supplements we track: 3.9/5. Of 202 rated owner comments, 161 were positive, 6 mixed and 35 negative; 18 mention an unwanted effect. People talk most about bloating & gas and regularity.
Reddit comments are self-reported and unverified. They tell you what people noticed, not whether a supplement works or is safe for you.
Our fiber supplement comparison guide explains the gentler options. People also compare supplements for SIBO on Reddit. See what owners report about gut supplements for antibiotics.
What it is
- PHGG is guar gum broken into shorter chains, so it dissolves without thickening drinks.[PubMed]
- Randomized trials have measured its effect on stool frequency and form in healthy adults and in long-term-care residents.[PubMed][PubMed]
Safety and interactions
- Fermentable fibers can cause gas at first; most studies start at a few grams a day.[PubMed]
Supplements can interact with medicines. Talk to a doctor or pharmacist first, especially if you are pregnant, take prescription medicine, or have red-flag symptoms. See supplement safety and interactions.
Reports by symptom
| Context | Rated owner comments | Positive | Negative | Unwanted effects |
|---|---|---|---|---|
| SIBO | 137 | 107 | 25 | 11 |
| IBS-C & constipation | 51 | 40 | 9 | 7 |
| Bloating & gas | 47 | 37 | 9 | 8 |
| After antibiotics | 33 | 25 | 5 | 2 |
| Pain & cramping | 22 | 11 | 11 | 3 |
| IBS-D & loose stools | 18 | 15 | 2 | 1 |
| Stool form | 8 | 5 | 2 | 2 |
What Reddit owners say
Commonly praised
- Bloating & gas: 18 owner comments
- Regularity: 16 owner comments
- Stool form: 13 owner comments
Common complaints
- Side effects: 15 owner comments
- Bloating & gas: 8 owner comments
- Pain & cramping: 6 owner comments
4/5“PHGG with water. These all have really helped me.”
4/5“I Figured out the motility issues 2 years ago and what helped me is phgg sunfiber before lunch, a cup of stash ginger tea for lunch and dinner.”
5/5“I think personally best thing to do is take Inulin, phgg, diverse fiber diet..”
2/5 Bloating & gasSide effects“PHGG made my bloating worse before I added 5-HTP.”
2/5 Bloating & gasSide effects“Yeah, if I had my preference I'd get to two kiwi before starting the Sunfiber, just because that's what I started with.”
+30 more owner comments
4/5 Bloating & gasRegularity“Idk if it was the PHGG causing the insomnia back then btw, maybe it was just a coincidence.”
4/5“As far as what helps me: Life Extension's optimized garlic taken with meals containing red meat or eggs, Neem, Triphala, Ginger and PHGG.”
4/5 Gentle“I have been taking 1 Ltheanine b1 400 2 x a day for 2 months along with Phgg 1 tsp 2 x a day and 1 vitamin d 1000.”
4/5“I use a combination: magnesium at bedtime, PHGG mixed with my electrolytes during the day, 2 cups of coffee in the morning.”
4/5 Urgency & loose stools“Been dealing with chronic diarrhea for months and my naturopath just recommended Tomorrow’s Nutrition brand SunFiber.”
4/5“I find that PHGG helps me also.”
4/5“You can try partially hydrolized guar gum (PHGG) to normalize motility.”
4/5 Regularity“My naturopath who specializes in sibot, Mcas and others recommended I take sunfiber pro.”
4/5“SunFiber has helped me so much, but all other fibers make me flare so much.”
4/5 Bloating & gasCost“The thing that set off the bloating so bad that I was doubled over in pain it was the fact that I had tried a different PHGG - one that contains some amount of baobab powder.”
4/5“Anyway, point is, lots of things work for different folks, but I had never heard of PHGG before and it works for me!”
4/5“I have not tried chia, but I did try PHGG which sometimes helped and sometimes didn’t.”
4/5“Most issues would be after dinner so I’ve found that taking a gut low Fodmap friendly fibre with dinner(PHGG) has helped a lot.”
4/5 Regularity“Yes, I take PHGG every day, greatly helps me be regular which is difficult with IMO so very beneficial for me.”
4/5“The only thing that’s consistently worked for me is Sunfiber 1-2x a day.”
4/5 Bloating & gas“•my SIBO improved through low Fodmap elimination diet with PHGG but still need to improve my bowel motility.”
4/5“Some safe products that helped me with symptom management were phgg for constipation, chamomile tee (from the pharmacy) reduced stomach noise and high quality olive oil reduces inflammation, you can also try olive leaf tea but less effective.”
4/5 Stool form“I use phgg and helps move things smoothly, but lacks bulk”
4/5“I also discontinued PHGG and it helped me, surprisingly.”
4/5“PHGG worked for me, start with half a scoop or you'll regret it.”
4/5“I take sunfiber! Was recommended to me by my nutritionist and it’s worked really well for me.”
4/5“Phgg works for me also eating enough”
2/5“I tried phgg and it didnt do much to my lacto and bifido species or numbers.”
1/5“I was taking full dosage Invivo PHGG prebiotic.”
5/5“Life changing for me and superior to PHGG.”
4/5 Urgency & loose stools“I started PHGG maybe a week ago so I’m not sure it’s helping yet, I took half a scoop for the first few days and am gradually building up.”
4/5“PHGG (Sunfiber) is where I’d start + berries.”
5/5“PHGG fiber (I put a scoop in my ginger tea every day) worked wonders for me personally!”
4/5“I use Sunfiber and it helps to get things moving.”
2/5 Bloating & gasPain & cramping“Ya psyllium made things worse for me but I started taking it in an empty stomach so I might try again with a meal and see but I took PHGG for a while.”
Brands with their own owner reviews
- Sunfiber: 4.0 from 147 owner comments
Example products
These are examples of PHGG (Sunfiber) products sold on Amazon. They are not ranked by Reddit and the score above is for the ingredient, not a specific product. Check the label for dose and other ingredients.
Example product · not Reddit-scored
Healthy Origins Healthy Fiber Powder 7.9 oz (225g), Featuring Sunfiber Partially Hydrolyzed Guar Gum (PHGG), Supports Digestive Regularity
Brand on Reddit: 4.0 from 147 owner comments · Sunfiber owner reviews
$18.99 on Amazon (price as of 2026-11-03). Prices change; check Amazon for the current price.
Example product · not Reddit-scored
Doctor's Best Prebiotic Powder Supplement with Sunfiber Guar Fiber, 7.4 oz
Brand on Reddit: 4.0 from 147 owner comments · Sunfiber owner reviews
$19.99 on Amazon (price as of 2026-11-03). Prices change; check Amazon for the current price.
Example product · not Reddit-scored
Bluebonnet Nutrition Sunfiber, 7.4 oz
Brand on Reddit: 4.0 from 147 owner comments · Sunfiber owner reviews
$18.36 on Amazon (price as of 2026-11-03). Prices change; check Amazon for the current price.
Research to read
Published studies (we list them so you can read the evidence yourself; inclusion is not an endorsement):
- Nutrients 2019: Effect of Repeated Consumption of Partially Hydrolyzed Guar Gum on Fecal Characteristics and Gut Microbiota: A Randomized, Double-Blind, Placebo-Controlled, and Parallel-Group Clinical Trial.
- J Nutr Health Aging 2022: Effectiveness of Partially Hydrolyzed Guar Gum in Reducing Constipation in Long Term Care Facility Residents: A Randomized Single-Blinded Placebo-Controlled Trial.
- Am J Clin Nutr 2019: Prebiotics in irritable bowel syndrome and other functional bowel disorders in adults: a systematic review and meta-analysis of randomized controlled trials.
FAQ
What do people with IBS say about PHGG (Sunfiber) on Reddit?
Across 507 Reddit comments from people who say they have used it, 161 of 202 rated comments were positive and 35 negative, for a GutVerdict score of 3.9/5. These are self-reported experiences, not clinical evidence.
Do people report side effects with PHGG (Sunfiber)?
18 of 202 rated owner comments (9%) describe an unwanted effect such as gas, bloating or an upset stomach. Check the safety notes on this page and ask a doctor or pharmacist before starting.
Who talks about PHGG (Sunfiber) most?
Most rated owner comments come from people in r/SIBO and others who mention SIBO (137 comments, 107 positive).
Is PHGG (Sunfiber) scored on clinical evidence?
No. The score summarizes Reddit owner comments only. Factual statements on this page link to NIH or PubMed sources, and nothing here is medical advice.
Related supplements
Fiber
Acacia fiber
3.8 (106 owner comments)
GentleRegularity
“Acacia is the other gentle one worth knowing about, it ferments so slowly that even sensitive guts handle it well and it actually feeds Bifidobacterium selectively.”
What owners report →
Fiber
Wheat dextrin (Benefiber)
3.7 (92 owner comments)
RegularityPain & cramping
“Switching to 2 teaspoons of Benefiber twice a day has helped me a bit with this.”
What owners report →Comparisons: Psyllium husk vs PHGG (Sunfiber) · PHGG (Sunfiber) vs Inulin / FOS
Last updated 2026-11-03. Mentions scanned: 2048 in 1244 threads.