Hi Everyone. Just joined so that I can raise a very important discovery I and my wife made recently. To introduce the subject. A little background. My son was born with Lactose intolerance, and was subsequently prescribed WYSOY by SMA. Just so you are in NO doubt. <br>He has been on this formula for Over 22 years. It is the Only milk he can drink. When he was 10/11 years old we found out he had kidney stones. He was passing blood after a football hit him in the back.<br>The first treatment was Lithotrypsy which dealt with the stones. But over a number of years they have returned. Now one has almost completely filled one kidney, and the other has recently been treated with keyhole surgery. My son is 23 this year, so for 13 years or so, his kidneys have been making more stones. I have always questioned whether the WYSOY FORMULA could be to blame. We were repeatedly assured by doctors etc, that it wouldn`t be the WYSOY FORMULA. But.....Now my wife and I are certain that it IS the WYSOY FORMULA. Does anyone else have any evidence of this problem.