Acid Block is a combination of nutrients designed to provide relief of intermittent heartburn and indigestion.* Alginic acid and sodium alginate react with saliva and gastric acid to form a foamy froth or alginic raft that floats on top of the gastric contents and acts as a barrier to acid and food reflux. Slippery elm and deglycyrrhized licorice act as demulcents which are soothing to the alimentary canal.*