 A worldwide leader in microbiome health for over 40 years, Dr. O'Hara's Probiotics is an enriched full-spectrum probiotic system fermenting multiple strains of probiotic bacteria and nourishing prebiotics. The result? Transformative postbiotic metabolites that maintain and support the biodiversity of flora in your gut for off-digestion, gut-brain, and immune health. Dr. O'Hara's. Certified vegetarian, free of gluten, allergens, dairy, and GMOs.