I had an UTI and was told Niacin would help it go away. I had no money and had this at home so I took one 500mg cap a day and drank plenty on water for 7 days. I ended up getting a random drug test and the results said my creatinine was too low. Iddidn t even know what that was but they assume I tried deputing my urine and that s not the case. I told them this stuff was the only thing I have ingested, so.. I have 2 questions.. Does Niacin help with UTIs? Also could niacin make my urine test results on creatinine levels occur that way. I m curious and scared and could really use answers, and from someone who for sure knows the right answer.