Depends on quality - rather then focusing on one single probiotic, I’d recommend you to add as much probiotics as you can and rotate them often. Kimchi, sauerkraut, liquid probiotics such as kombucha, jun, ginger beer plant, water kefir... For the milk-based probiotics (yogurt, kefir, sour milk) shoot for full-fat non-flavored versions from organic milk.
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