I'll never forget my first, and only bout with kidney stones. I took Universal's "Animal Stak", Animal Pak's, and Animal cuts, for a VERY long time, most likely way more that they reccommended, and regrettably not drinking near enough water. Was it that huge amount of pills on a daily basis, or the lack of hydration that caused the stones, whatever the reason, I never did the "Animal" line again, and never experienced kidney stones again as well. I can't even describe the pain.