We've discussed this before. Kidney stuff is trash. The only ingredients in there that have a modicum of evidence behind them are flax seeds and beetroot powder.
There are much better products out there, like the product mentioned by prodaf. In any case, these supplements on their own won't do much. You also need to make sure that your blood pressure is under control (using proper medication), that you don't take any renotoxic medications (like painkillers), that you have a healthy diet that is sufficiently plant-based, that you keep your protein intake reasonable, that you're not insulin-resistant, that you go easy on the AAS when blood work deteriorates, etc.