I have never tried rejuvelac but I recieved my first kefir grains in the mail a few days ago. I drank my first batch last night and am very tired today. I think these good guys may be killing of the baddies. YAY! I've heard so many things about fermentation I am just that that I stumbled upon it. Good luck with your rejuvelac, I'll keep you all posted on how the kefir works out!