Dr. Formulated. Pre + post + probiotics. 50 Billion 14 probiotic strains. Zinc & vitamin D 3 x action formula. Triple action formula. A complete probiotic formula with pre + pro + postbiotics, plus zinc and vitamin D delivering powerful immune and digestive support. Prebiotic: clinically studied to promote the growth of good bacteria. Probiotic: featuring clinically studied strains proven to promote immune system health and regularity. Postbiotic: our exclusive upcycled metabolites that support probiotic growth. Bifidobacteria. CFU/mL. Time (24h). B. Lactis only. B. Lactis + postbiotic. David Perlmutter, M.D. One of America's leading experts in the human microbiome. The PreforPro difference. Clinically proven prebiotic that increases the growth of good bacteria, and limits the growth of bad bacteria. Certified B Corporation.