The micro-organisms in Bifido-Complex are natural inhabitants of the intestinal tract. Bifido-bacteria live mainly in the colon while lacto-bacilli inhabit the small intestines. As much as 98% of the fragile, living organisms in many products are destroyed by harsh stomach acids before they reach the lower intestinal tract. Bifido-Complex is acid resistant and heat tolerant to allow the product to pass through stomach acids intact to deliver maximum potency to the lower intestinal tract where it is needed to support and promote healthful organisms.