"Quality probiotics" refers to beneficial bacteria or microorganisms that are of high standard in terms of their potency, purity, and effectiveness in promoting a healthy balance in the gut and overall well-being. Full definition
You might also want to include high quality probiotic supplement in your diet. (supernutritionlife.com)
As a comparison, some of the highest quality probiotic supplements out there, contain 50 billion per serving (1 capsule / serving, typically). (healthbean.ca)
It is therefore very beneficial for those who want to prevent or increase B12 levels to take good quality probiotic supplements containing the above mentioned strains. (fullhealthsecrets.com)