Is kefir a good probiotic for opportunistic bacteria if I have a leaky gut?

Kefir made from raw milk is a highly effective probiotic for addressing opportunistic bacteria and leaky gut due to its diverse range of beneficial yeast and bacteria. For optimal results, consider making kefir yourself using a starter kit. If kefir isn't suitable, other excellent options include kimchi, sauerkraut, and spore-based probiotics.