Yellow Skin (Jaundice): Causes, Symptoms, Prevention, and Treatment Options Meto blog Why is My Pee Bright Yellow? Yellow Urine Causes & Symptoms 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 The standard color of your urine is referred to by doctors as urochrome. Urine naturally carries a yellow pigment. When you're staying hydrated, your urine will be a light yellow, close to clear color. 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