Advanced Acidophilus Probiotics utilise a polysaccharide matrix supplies enhanced shelf stability and protects the organisms from destruction when exposed to the stomach acid. Solgar Advanced Acidophilus vegetable capsules Provides L.Acidophilus. A Source of L. Acidophilus, a Beneficial Microorganism that Survives Stomach Acidity and Naturally Resides in the Lower Digestive Tract to help Maintain a Healthy Intestinal Flora.