Ref-b
I'm probably a certified idiot, but I've never heard of anything other than the normal Loeffler 25mg/ml variety and their similar tabs. At 100mg/ml you'd be shooting/drinking little tiny doses during the day unless you were really going nuts on it. Why do you want such a concentrate? Just curious.
P.S. You probably know you can get the Loeffler in a 50ml vial, but in case you didn't, now you do. A couple of those and yer all set.