Thomas, the probiotics, kefir, yogurt, and sauerkraut are responsible for building a healthy flora (communities of beneficial bacteria) in your system, and one of the main functions of the flora is to produce all of the B vitamins that your body needs in the correct amounts. Only during the highlight of the treatment is taking individual vitamins sometimes found to be useful.
Vitamin B-12 is also known as cobalamin.
Here’s a food chart with the most notable foods containing B12.
B6, also known as pyridoxine; below is the chart showing the most notable food sources.
Still, the best and highest quality source is from probiotics.