PHGG (partially hydrolyzed guar gum): PHGG is a fully soluble fiber made from guar beans. "Partially hydrolyzed" means the fiber has been enzymatically shortened, which is what lets it dissolve clear in water instead of thickening into a gel the way psyllium husk does.
PHGG ferments slowly across the length of the colon rather than rapidly in the first stretch of it. That slower fermentation is why PHGG is generally better tolerated than inulin or chicory root, which produce gas quickly and are the fibers most often behind the bloating people report when they start a prebiotic.*
PHGG is one of the most studied prebiotic fibers, with published research on stool consistency, transit time and tolerability.
Solnul ®(resistant potato starch): Solnul® is a resistant starch (type 2) made from peeled, non-green potatoes. Resistant starch passes through the small intestine undigested and becomes food for bacteria in the large intestine.
In a randomized, double-blind, placebo-controlled trial published in Nutrients in 2023, 3.5 g per day of Solnul® resistant potato starch increased Bifidobacterium and Akkermansia muciniphila in healthy adults over four weeks.* (Nutrients 2023;15(7):1582. PMID 37049425.)
What's not in it: No inulin. No chicory root. No soluble corn fiber. No added sugar, no artificial sweeteners, no flavoring, no fillers. Two fibers, nothing else.