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Partially Hydrolysed Guar Gum

Dietary fiber plays a very significant role in modifying the intestinal microbiota, exerting prebiotic effects such as stimulating the growth and/or function of beneficial intestinal microorganisms. Changes in the gut microbiota composition are classically considered as one of the many factors involved in the pathogenesis of either inflammatory bowel disease or irritable bowel syndrome. The use of particular food products with a prebiotic effect has thus been tested in clinical trials with the objective to improve the clinical activity and well-being of patients with such disorders. Partially Hydrolyzed Guar Gum (PHGG) is a natural dietary fiber: it is a white powder, water-soluble, colorless and transparent in water solution and almost tasteless. PHGG is stable and soluble at various pH levels commonly found in foods as well as resistant to heat, acid, salt, high pressure and digestive enzymes.


Relieves symptoms in constipation-predominant irritable bowel syndrome (IBS) and may have prebiotic properties (Russo et al., 2015)

The results of this study support the administration of 6 g/day PHGG for IBS patients with bloating (Niv, 2016)

PHGG increases the concentration of bifidobacterium and lactobacilli species and increases short-chain fatty acids in the colonic lumen. It has also been shown to have a positive effect on some medical conditions, e.g., reducing blood cholesterol and controlling blood sugar levels. In addition, it was found to be effective in the treatment of acute diarrhea in children and adult patients of intensive care units. PHGG has proved to be effective in softening and improving fecal output and increasing bulking capacities (fecal weight, frequency of defecation, and fecal excretory feeling (Niv, 2016)

In a review article published in 2013 the authors stated:

New open horizons can be gimpsed for SIBO treatment, lowering or maximising the antibiotics use.

Not all fibres are the same: this is fact.

In another paper it was concluded that:

Four-week PHGG use accelerates colon transit time in patients with chronic constipation, especially in those with slow transit, and improves many of their symptoms including frequency of bowel movements.

And finally:

Consumption of I-PHGG produced clinical results comparable to placebo in constipated females, but had additional protective effects on gut microbiota by decreasing the amount of pathological bacteria of the Clostridium genera.


It seems a trial of PHGG may be an initial step in those suffering with irritable bowel syndrome, especially hen constipation dominates. Dr. Siebecker states that it doesn’t lead to gas formation, and the research above has shown it reduces bloating. The fact that is also increases the diversity of the microbiome suggests it may be particularly useful for those following a SIBO/low FODMAP style diet.