what vitamin makes your pee yellow

Vitamin B2 (riboflavin) is the primary vitamin that turns urine bright yellow.

This harmless effect happens because riboflavin, a water-soluble vitamin, gets excreted through the kidneys when you take more than your body needs, often from multivitamins or B-complex supplements. The fluorescent yellow hue can appear neon or highlighter-like, fading within hours as it's cleared from your system.

Why Riboflavin Stands Out

Riboflavin naturally has a vivid yellow pigment—its name even derives from Latin for "yellow." High doses (like 25-100 mg in supplements) overwhelm the body's storage, leading straight to the bladder. Unlike fat-soluble vitamins, water-soluble ones like B2 don't accumulate; excess simply colors what you flush away.

Common Triggers

• Multivitamins or B-complex : Packed with 10-100x the daily 1.1-1.3 mg need.

• Energy drinks or fortified foods : Sneaky sources amplifying the glow.

• Other B vitamins : B12 might deepen the shade, but B2 dominates.

Health Angle

No worries—it's a sign your kidneys work fine, not a deficiency or danger. Daily needs stay low, but supplements safely exceed for benefits like energy metabolism. Rare high doses over 100 mg might irritate, but typical use is golden (pun intended).

Forum Buzz

Online chatter, like Reddit's r/explainlikeimfive, calls it "highlighter pee" from B2—folks confirm it post-supplement. Threads since 2015 echo: dilute with water? Still yellow if B2-loaded.

TL;DR: Blame riboflavin (B2) for that sunny splash—safe, temporary, and telltale of excess intake.

Information gathered from public forums or data available on the internet and portrayed here.