Dr. Tobias Deep Immune Probiotics contains both a probiotic as well as a prebiotic.  Prebiotic helps support gut health by going after the bad bacteria and generating more good bacteria in the process.  It is a great, every day supplement.    

Dr. Tobias Probiotics 30 Billion are for intensive support that is needed for example, following a round of anti-biotics or other situations that may have led to depleted good bacteria.  It does not contain a prebiotic and may be used on its own, or in combination with with prebiotic formula such as Dr. Tobias Prebiotics.