First time taking a multivitamin. Urine is neon yellow and it's freaking me out : r Supplements This Gut Enzyme Helps Turn Urine Yellow and Affects Our Health, Too NLM Musings from the Mezzanine What Is Glutathione? Health Benefits, Risks, and More Vitamin B supplements, especially those containing riboflavin (vitamin B2), often cause bright yellow or neon colored urine. This happens because excess riboflavin is water soluble and is excreted through urine when the body has Why is my urine bright yellow? Get the Gloss What Color is Your Pee?, While this demonstration isnt perfect and it can vary, the overall colors used are meant to point you in the right direction., Most people think having clear pee is