Spend $100 and get free shipping Australia wide! PHGG Partially Hydrolysed Guar Gum - 300g - 60 Servings. Partially Hydrolysed Guar Gum is a unique soluble fibre, also known as an indigestible complex carbohydrate, that is naturally derived from the guar bean plant. PHGG naturally contains glucomannan, a prebiotic starch that helps to feed the good bacteria in the colon, thereby enhancing short chain fatty acids (SCFA's), Bifidobacterium, and lactobacilli species which positively benefit gut health.