Lindens Pro Billion X20 contains only lactobacillus acidophilus, a well-known lactic acid bacterium. Lactobacillus acidophilus is often used in dietary supplements and fermented foods such as yogurt.

CFU stands for Colony Forming Units. This is a measure of the number of bacteria present in a supplement or product. Each CFU represents one live bacterium capable of reproducing and forming a "colony." The more CFU, the greater the number of bacteria ingested.

Fructo-oligosaccharides (FOS) are fibers, meaning these nutrients are not digested by the body. FOS naturally occur in certain plants, such as onion, asparagus, banana, and leek.

No, this product does not require refrigeration. Simply store it in a cool, dry place away from direct sunlight.