Partially Hydrolyzed Guar Gum or PHGG is a water soluble dietary fiber.
The partially hydrolyzed guar gum has a low viscosity which allows its use in enteral products and beverages and provides health benefits associated with dietary fiber ingestion.
If you consume too much food containing the partially hydrolyzed guar gum then there could be some negative side effects but in small amounts it's not harmful to you and may be healthy for you.
The partially hydrolyzed guar gum or PHGG is found in a lot of processed foods that you buy in stores and it should say on the food packaging if it does contain the partially hydrolyzed guar gum although some foods may not list it on their packages as the ingredient even though it might contain it.