I don't know if these products contribute to size change, as I have been using them since the day I was born, it's very common for us to consume in Greece and generally Balkan peninsula and Turkey. Such products are widely distributed and produced in all these countries. The local sheep yogurt factory has a selling spot just a couple of miles from my house and their price for sheep yoghurt is really good, like their equivalent to us dollar selling price would be about 1,80 us $ per pint or something ... I think best us prices for similar products start at 2 dollars per pint, pls correct me if the usual price Is less.
Well this seller has goat milk kefir as well, which I absolutely adore. I don't know if those substances you mentioned are found I their products in such quantities, but it is so much better than cow's yogurt. Anyway, so as to contribute to the thread, I can't tell if these products made any difference to me when it comes to size, so as to help others decide if they should use them for this purpose.