Biote Multi-Strain Probiotic 20B is a unique probiotic blend that contains 20 billion active cultures per capsule. Biote Multi-Strain Probiotic 20B is a superior blend of freeze-dried Lactobacillus paracasei, Lactobacillus acidophilus, and two strains of Bifidobacterium lactis. It comes in individually-sealed blister packs for humidity and temperature control.