Pedialyte and Bright Yellow Urine: The Riboflavin Explanation

Bright yellow/orange urine after Pedialyte is normal and harmless. It's caused by riboflavin (Vitamin B₂), a water-soluble vitamin added to Pedialyte.

Mechanism

• Riboflavin is fluorescent yellow.
• Excess is rapidly excreted unchanged in urine (renal threshold low).
• Urine color intensity correlates with dose and hydration level.

Key Points

• Not a sign of dehydration (dark amber urine = concentrated). Neon yellow = riboflavin excretion.
• Not toxic. B₂ has no upper limit (UL) from food/supplements; excess excreted.
• Other B-vitamins (B-complex, multivitamins, energy drinks) cause same effect.
• Resolves within a few voids after stopping Pedialyte.

Pedialyte Composition Context

Pedialyte contains: Water, Dextrose, Electrolytes (Na⁺, K⁺, Cl⁻, Citrate), Zinc, Riboflavin (for color/stability). The color is intentional—helps identify the product.

Parents: No need to worry. Continue Pedialyte as directed for rehydration. If urine is dark amber (not neon) and output low → increase fluids.