Probactis Strep® contains Streptococcus salivarius K12, a probiotic strain naturally present in the oral cavity that produces natural antimicrobial substances, helping to maintain the defenses of the ear and throat. The Streptococcus salivarius K12 strain in Probactis Strep® is one of the oral cavity probiotic strains with the most clinical studies and published scientific literature. For adults and children over 5 years of age, Probactis Strep® promotes a healthy oral microbiota, which is our first line of defense for the ear, nose, and throat. With Streptococcus salivarius K12. With vitamin D. Clinically tested on children and adults. Instructions for Use: One lozenge to suck daily, at night, after brushing your teeth, for 3 months for an effect of 6 to 9 months.