All I can say is that you have to try QOD--original formula either Max or Gold. Their new Kerapremium is the old QOD Max formula. I can't speak about any other brand of QOD. I got lucky in that I had success with the first brand I tried. I followed another member's journey because she is my hair twin, and my results were the same as hers.
QOD original all the way--but, yes, it has aldehydes.