Most bacteria from pills, yogurt, kefir, and other ferments WILL make it to your gut.
Threelac has some good strains of bacteria but the CFU count is so low and its WAY too expensive.
If money is not a concern, give it a go.
Whoever told you only “Pearls” make it to your gut probably works for “Pearls”. Thats complete marketing BS.
You should check out the “Forum Strict Diet” that was designed by members here that cured their infestation -> The Protocol