Hi,

I try to rotate my probiotics, I have a degree in nutrition. This is a good guideline:

"A general recommendation is to choose probiotic products with at least 1 billion colony forming units and containing the genus Lactobacillus, Bifidobacterium or Saccharomyces boulardii, some of the most researched probiotics"

Cleveland Clinic (2018). How to Pick the Best Probiotic for You.

I take one that has at least 20 billion.

Best to you!