Sunfiber (PHGG) Dosage and Timing: What Owners Report
About this entry (PHGG (Sunfiber)): Partially hydrolyzed guar gum, a low-viscosity soluble fiber sold under the Sunfiber name.
In 24 Reddit owner comments that give an amount, the typical Sunfiber (PHGG) dose was 5 g (middle half: 5 to 10 g). The timing people mention most is in the morning (28 comments). These numbers describe what people with IBS say they take on Reddit (November 2025 to October 2026); they are not dosing advice. Follow the label and ask a doctor or pharmacist, especially if you take medicines.
Amounts owners mention
| Unit | Comments | Typical (median) | Middle half | Most-mentioned amounts |
|---|---|---|---|---|
| g | 24 | 5 | 5 to 10 | 5 (12), 10 (4), 7 (4) |
| scoops | 19 | 1 | 1 to 1 | 1 (14), 2 (2), 0.5 (2) |
| tsp | 10 | 1 | 0.63 to 1.38 | 1 (6), 1.5 (2), 0.25 (2) |
Counted from amounts written next to the name Sunfiber (PHGG) in 54 owner comments (a comment can give more than one amount). Products differ in strength, so a number of capsules or scoops is not comparable between brands. Most-mentioned: 5 g (12), 10 g (4), 7 g (4).
What studies and NIH sources say
- A 2022 trial in long-term care residents with chronic constipation gave 5 g of PHGG mixed in 200 mL of water once a day for 4 weeks.[PubMed]
- Fermentable fibers can cause gas at first; most studies start at a few grams a day.[PubMed]
When people take it
| Timing mentioned | Owner comments |
|---|---|
| In the morning | 28 |
| At night or before bed | 16 |
| With or after food | 11 |
| Split into two doses | 8 |
| On an empty stomach | 4 |
Phrases such as "before bed", "in the morning" or "with food" near the name Sunfiber (PHGG).
How long it takes, according to owners
| Timeframe mentioned | Comments | Positive | Negative |
|---|---|---|---|
| Minutes to hours | 1 | 0 | 0 |
| Within the first week | 5 | 2 | 2 |
| 1 to 4 weeks | 6 | 3 | 2 |
| More than a month | 1 | 0 | 0 |
13 owner comments mention a timeframe such as "after 2 weeks", "within an hour" or "it took a month". A timeframe can describe when someone noticed a change or how long they tried it before giving up, so read it as a rough signal.
2/5 Bloating & gasSide effects“PHGG made my bloating worse before I added 5-HTP.”
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.”
In their words
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“Also, instead of having eggs and rice for breakfast, I’ve started eating tummy-love protein with the SunFiber in the mornings before going to the gym.”
4/5 Bloating & gasRegularity“Second round, I did a regular diet at the recommendation of a new provider and also added 5 g of PHGG.”
3/5“Augmentin taken spaced out with 10g of PHGG got rid of my SIBO super fast.”
4/5“- together with phgg in the morning on an empty stomach (soluble fiber, start with low dose)”
4/5“I should mention that I am also taking PHGG first thing in the morning (it's a nonfermentable fiber that helps with methane reduction and to keep things moving), and to support motility I take ginger before bed away from food and artichoke…”
PHGG (Sunfiber) overall: 3.9 from 507 owner comments.
Frequently asked
How much Sunfiber (PHGG) do people take?
In 24 Reddit owner comments that give an amount, the typical Sunfiber (PHGG) dose was 5 g (middle half: 5 to 10 g). That is what people report, not a recommended dose; follow the product label and your doctor's advice.
When do people take Sunfiber (PHGG)?
The timing people mention most is in the morning (28 comments). At night or before bed: 16; With or after food: 11.
How long does Sunfiber (PHGG) take to work?
13 owner comments mention a timeframe near Sunfiber (PHGG) (for example "after two weeks" or "within an hour"). Minutes to hours: 1; Within the first week: 5; 1 to 4 weeks: 6; More than a month: 1. Individual experiences vary widely.