Since 1947 True Potency Probiotic Support Gluten, Wheat & Dairy Free Suitable for Vegetarians Shelf Stable - Once Daily Dietary Supplement Understanding probiotics can make a real difference in "how you think" about them. Today's advances focus less on the quantity and number of different strains and more on identified strains that deliver clinically supported results, true potency even at expiration, and strains robust enough to survive even harsh stomach acid. That's the difference you'll find with Probi 20 from Solgar. It delivers all this...and much more.