This is another Escherichia Coli probiotic, containing only this species but with six strains ( G3/10,G1/2, G4/9, G5, G6/7, and G8 2015)

• Strain are specified, likely source is Germany
• Studies finding close similarity to Mutaflor, implies human origin
• Known to persist in at least 10% of patients
• Well Studied

3.5 thumbs up out of 4 (confirmation of human source is missing)

US Source: German Apotheke

Studies

• A Review of Research Conducted with Probiotic E. coli Marketed as Symbioflor. – 2016
• Insights from 100 Years of Research with Probiotic E. Coli. – 2016
• Voluntarily exposure to a single, high dose of probiotic Escherichia coli results in prolonged colonisation. [2014]