You may have noticed partially hydrolyzed guar gum — or PHGG — on the ingredient label of your prebiotic fiber supplement and wondered: what exactly is it, and why is it in there? Here's everything you need to know, in plain English.
Where Does PHGG Come From?
Guar gum is a natural fiber derived from the guar bean (Cyamopsis tetragonoloba), a legume grown primarily in India and Pakistan. In its whole form, guar gum is a thick, viscous gel — useful as a food thickener but not particularly pleasant to consume as a supplement.
Partial hydrolysis is a controlled process that breaks the guar gum into shorter fiber chains using water and enzymes. The result is PHGG: a soluble, low-viscosity fiber that dissolves easily in water, has a neutral taste, and is far gentler on the digestive system than its parent compound.
Why Is PHGG Used in Gut Health Supplements?
PHGG has become a preferred prebiotic fiber for several reasons:
- Gentle fermentation: Unlike some fibers (such as inulin or FOS) that ferment rapidly and can cause gas and bloating, PHGG ferments slowly in the colon. This makes it well-tolerated even for people with sensitive digestive systems.
- Clinically studied: PHGG has been studied in multiple clinical trials for its effects on bowel regularity, IBS symptoms, and microbiome composition. Research supports its role in promoting Bifidobacterium and Lactobacillus growth — two of the most beneficial bacterial genera in the gut.
- Prebiotic activity: PHGG selectively feeds beneficial gut bacteria, producing short-chain fatty acids (SCFAs) like butyrate, propionate, and acetate — compounds that support gut lining integrity, immune function, and metabolic health.
- Texture-neutral: Because it's low-viscosity, PHGG dissolves completely in water, coffee, smoothies, or any beverage without changing the texture. You won't notice it's there.
What Does the Research Say?
Clinical studies on PHGG have shown promising results across several areas:
- Bowel regularity: PHGG has been shown to normalize stool consistency and frequency in people with both constipation and diarrhea-predominant IBS.
- Microbiome support: Regular PHGG intake is associated with increased populations of beneficial bacteria and greater microbiome diversity.
- Tolerability: In head-to-head comparisons with other prebiotic fibers, PHGG consistently shows lower rates of bloating and gas — making it a strong choice for daily use.
How Much PHGG Do You Need?
Most clinical studies use doses in the range of 5–10 grams per day. Our Daily Prebiotic Fiber is formulated with a clinically relevant dose of PHGG, designed to be taken daily as part of a consistent gut health routine. Consistency matters more than any single dose — the microbiome benefits of prebiotic fiber build over time.
Is PHGG Right for You?
PHGG is a good fit if you:
- Want to support gut regularity without the bloating that some fibers cause
- Have a sensitive stomach or IBS
- Are looking for a flavorless, texture-free fiber you can add to any drink
- Want a prebiotic that's backed by clinical research
If you're also interested in adding beneficial bacteria alongside your prebiotic fiber, our Daily Synbiotic combines PHGG with clinically studied probiotic strains for a comprehensive gut health approach.
*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.