Extra strength (Olly Extra Strength Probiotic has 6 billion probiotics per serving compared to 1 billion per serving in Olly Probiotic). 6 billion probiotics. A boost to support immune & digestive health. 2 powerful probiotic strains. Naturally Tasty: Crispy sweet; Pink lady apple. Double Down: Feeling less than extra? Here's a super dose to help you get back on track. This powerful pair hits your digestive tract alive and ready to roll. Game on! The Goods Inside: Bacillus Subtilis: This native super star promotes peaceful pipes to help keep things running smoothly and on the regular. Bacillus Coagulans: A hero strain that works with your body's natural bacteria to support a healthy digestive tract and immune system. Certified B Corporation. Proud to be a Certified B Corporation.