Neon yellow urine

I’m unaware if I have an iron deficiency, and heard taking iron supplements wouldn’t hurt if you take them and don’t need them. That may be untrue, but I only take them every other day instead of once or twice a day. I took one last time and it turned my urine neon yellow and I looked it up and it said that it means you have too much Vitamin B2 in your system and it’s a bad sign. I also read it was a good thing? Unsure of which one it may be I thought id ask you guys. And I only drink water so that’s why I assume it’s from the iron pill.