why is my pee neon yellow

Neon yellow urine is most commonly caused by excess Vitamin B2 (also known as riboflavin) in your system. Riboflavin is a water-soluble vitamin that is naturally a vibrant, fluorescent yellow-green color. Because your body can only absorb a certain amount of it at one time, your kidneys filter out whatever is left over and flush it out through your pee, causing that striking “highlighter” glow.

This visual effect is completely harmless and is simply a sign that your body is getting rid of excess nutrients it doesn’t need.

Typical Triggers for Neon Yellow Pee

• Multivitamins & B-Complex Supplements: Most over-the-counter daily vitamins contain high doses of riboflavin.
• Energy Drinks & Pre-Workouts: These beverages are frequently fortified with massive amounts of B vitamins to support energy metabolism.
• Fortified Foods: Certain cereals, nutritional shakes, or food dyes can also introduce enough riboflavin to alter your urine color.
• Mild Dehydration: While dehydration alone typically makes pee look dark amber, being low on fluids concentrates the urine, which can make the neon glow of B vitamins look even brighter and more intense.

When to Seek Medical Care

While neon yellow pee itself is not a cause for concern, you should pay attention to how your body feels. Schedule an appointment with a doctor if the bright color persists long after you have stopped taking supplements, or if you experience any of the following warning signs:

• Pain or burning when you urinate
• Cloudy or foul-smelling urine
• A transition to orange or brown, which could point to a liver or gallbladder issue
• Yellowing of your eyes or skin (jaundice)
• Fever, chills, or deep back/flank pain

To help narrow down what is causing this, have you recently started taking any new multivitamins, B-complex supplements, or drinking energy drinks? Sharing if you have any other symptoms like pain or changes in fluid intake would also be very helpful.