When a regular capsule or pill is ingested it must first pass from the mouth through the digestive system to finally be absorbed in the small intestine.
During this process, digestives enzymes in the mouth and stomach, digestive acids, bile salts and various gut flora degrade the nutrients before they are finally metabolised by the liver and made available to the body.
This entire process slows and reduces the nutrients' bioavailability.
Phospholipids are impervious to the various digestive juices. This makes liposomes the perfect delivery system for acid and enzyme-reactive substances.