Custom Probiotics, Inc., founded in 1999 by chemist and chemical engineer Harry Bronozian, is a Glendale, California-based company specializing in formulating and supplying high-potency, high-purity single and multi-strain probiotic dietary supplements for both children and adults. The company's inception was inspired by Bronozian's personal experience with Helicobacter Pylori infection; after trying various probiotic supplements without success, he developed his own multi-strain, high-potency formula, which effectively managed his condition. ​

Custom Probiotics offers a diverse range of probiotic supplements, including multi-strain and single-strain formulations, available in both capsule and powder forms. Their products are free from additives, carriers, dairy, sugar, gluten, soy, casein, yeast, maltodextrin, artificial colors, flavors, preservatives, FOS, inulin, and genetically modified ingredients, ensuring high quality and purity. The company emphasizes rigorous independent laboratory testing to guarantee potency and freshness, making their products highly recommended by healthcare professionals. ​

As of January 2018, Custom Probiotics continues to sell its products online, maintaining its commitment to providing affordable, high-quality probiotic supplements formulated to meet the specific needs of individuals across all age groups. ​