Our topical probiotic sprays for children, adults and pets, are formulated without any preservatives. The products contain live probiotic bacteria and purified water, and nothing more. They contain at least 8 billion cfu’s of probiotic per 4 oz bottle. The probiotic is grown with 100% organic ingredients, no chemicals, no pesticides, etc. It’s been organically approved. And if the probiotic would somehow be contaminated or go bad it would smell terribly rotten. We have studies that show our probiotic is still viable after 7 years.