I think kefir is very slightly bad like other items like greek yogurt, oat bran, rice, etc. Atleast cow’s milk kefir/yogurt…
Goat’s milk kefir contains less bad stuff and is generally from a healthier animal.
At my local store, there is lactose free goat kefir that I tried one time and this might be the best option…I did see candida as one of the strains within it though.
The main thing to worry about is the caseine in my opinion, this messes up methylation cycles and aids in a cycle that benefits the yeast. The second thing to worry about is whether its from a cow or not. The third thing to worry about is whether it gives you a reaction or not.
I switched from cows yogurt to goats yogurt recently and feel a ton better in general.