Immune Max Immuno-Biotic Defense Mints deliver 12 billion cells of a unique probiotic strain, HK Lactobacillus plantarum L-137, which is clinically studied to support your respiratory & immune health with a fresh burst of mint that is sure to open up your senses. Stress & fatigue can easily lower immunity, and this formula helps boost the immune system when you are under occasional stress by increasing natural killer T-cell activity, which are on the front lines to help protect against seasonal threats.