What should i look for in a probiotic supplement to replenish good gut bacteria during/after a course of antibiotics? which types/strains are beneficial and how many cfus? are pill forms or food forms (yogurt, kefir, etc.) better absorbed?

Lactobacillus GG: There are many Lactobacillus types, and different studies have tried various amounts of billions CFUs (colony forming units). There is not much good research that one can find on one particular brand or strain of Lactobacillus, but the GG strain in Culturelle did show benefits for antibiotic users (to decrease diarrhea symptoms). Food forms give people too much sugar.