Personally have never used sauerkraut juice as a cheese starter — I do not see any problem with doing so if you have a strong culture to start with. (rouxbe.com)
This led me to the idea of using my purple sauerkraut juice as a coloring agent. (homegrownandhealthy.com)
When serving, pour a little sauerkraut juice into each bowl for added flavor and a probiotic boost. (westonaprice.org)