Over 1,000 scientific studies and 30 years of research have demonstrated the safety and efficacy of this probiotic strain, Lactobacillus rhamnosus GG. In addition to the Lactobacillus rhamnosus GG strain, the super immunity kids chewables contain an good source of Vitamin C, Vitamin D and Zinc are made from naturally-sourced Elderberry fruit juice, an ancient superfood.