Natural Factors Senior's Multi Probiotic - Provides 8 probiotic strains that support digestive health and combat age-related reductions in immune system function. Each strain has been carefully selected for its natural resistance to gastric acid, allowing the probiotics to reach the intestines at full potency. This formula not only offers Lactobacilli to support small intestine health, but also Bifidobacteria, the most prevalent friendly bacteria in the large intestine. This senior-specific formula helps replenish these bacteria species, which decline with age. Probiotics help relieve constipation, gas, and bloating, and combat age-related decline in immune system function. Enteric coating is not required for all probiotic strains. With regards to stomach acid resistance, not all strains are created equal. Natural Factors has carefully selected naturally acid-resistant strains so they may be consumed at any time, with or without meals, and are safely delivered to the intestine unharmed.