I see people all the time spending tons of money on pills for Gut health, digestion problems and all other kinds of G.I tract disorders. I do not know how they just don't do a little research and make their own Saurkraut and save tons of money while having a much more effective probiotic right in their fridge in quantity for when ever they want.
All you need to make 2 big Mason Jar containers is 2 fresh cabbages, Pickling Salt or Sea Salt, it cant have iodide. You just slice the cabbage real fine then put it in a big enough bowl so you can mash it down with something to get the juices out of it drawn quicker by the salt. Mix it all around and mash it with a mallard or some kind of object to bruise the leaves and draw the liquid out. Leave it out for an hour then push all of the cabbage and liquid into the jars until all of the cabbage leaves are under the brine, this is very important because if anything is left above water it can create fungus and spoil.
Leave outside for about a week and you will see fermentation bubbles rising to the surface, about every 2 days pry the lid open to let some of the gases escape. Once you are done with the fermentation process transfer your jar to the fridge and enjoy your fresh fermented sauerkraut.