Unlike most fiber The secret is 100% natural psyllium fiber. lt forms a gel that helps trap and remove the waste that makes you feel sluggish. Metamucil is the only leading fiber brand that contains psyllium. The key ingredient in Metamucil is psyllium husk - a 100% natural fiber. Metamucil works with your body's natural process to promote digestive health. Metamucil traps and removes the waste that makes you feel sluggish. You'll feel lighter and more regular, especially if you're currently among the 95% of Americans who don't get enough fiber in their diet. Try it and feel what lighter feels like.