Metamucil is a fiber supplement that may benefit people who don't get enough fiber in their diets. Metamucil's main ingredient is psyllium, a natural fiber from psyllium seed husk. It comes in ...

Fiber supplements include inulin, psyllium (like Metamucil) and methylcellulose ... by 0.68% in individuals with type 2 diabetes. That’s considered a significant change: A 1% decrease in ...