In addition to *dose*, specific strains matter too. For instance if you have a specific strain of B. animalis, that survives greater pH ranges and both aerobic and anaerobic conditions it may take much less than a strain that is not as tolerant of those variations.
Just something to keep in mind.
In no particular order...
Prescript Assist
Body Biotics
Both of which have humic and fulvic.
Super Shield
LB17
L. Salivarius
there are other good ones out there - but those are perhaps a few of the best.