I doubt anyone on here would know the answer. Googling turmeric suggests that if your kidney stone problem is an oxalate problem, then turmeric might in fact increase the chances of additional kidney stones. How much depends on the type of supplement -- the oxalate is in the turmeric powder used in cooking and in some supplements, but these days most turmeric supplements are standardizing for circumin, the ingredient thought to be most responsible for beneficial effects. Depending on the ratio of circumin to turmeric powder in the supplement, you might have a problem and you might not. As with most supplements, however, another question that is impossible to find answers to is whether any actual human being has ever been found that suffers the theoretical bad effects of taking a truly natural substance such as turmeric powder. I think the issue is probably more complicate than you're going to be able to learn definitively, because oxalates are generally not a problem for most people -- the body handles them. They are present in all green leafy vegetables, and you will find people telling you not to eat them because of that, but how your body deals with it determines the consequences, not the food. To be safe, if your problem was an inability to handle oxalates, then you're going to want to limit turmeric powder to be safe because although the harm is only theoretical, that's all there is to go on at this point. If your supplement is almost all circumin and not turmeric powder, there might not be much oxalate left in it, but of course, it should be mentioned that when you standardize an herb this way you're actually producing a drug nobody ever took before and there might be other unknown issues. Also, if the colitis gives you problems, turmeric might be helpful and harmful, as it's a hot herb. Again, you're not going to get a definitive answer because only patented substances have a lot of research on them. Everything else has theoretical research but perhaps no single human ever having been found to have formed kidney stones because of turmeric. Doesn't mean it doesn't happen, but means nobody ever found it happening.