The Vitamin B2 (riboflavin) in Premium Insurance Caps is the reason for the bright yellow color change in urine. Among its many functions, riboflavin helps co-enzymes break down carbohydrates, protein, and fats. As the flavins in riboflavin are utilized in the body to metabolize carbs, fats and protein they pass along flavin rings which have a neon yellow color. That’s why urine is a brighter yellow color after taking Premium Insurance Caps and especially after consuming carbs, protein, and fats, It is NOT 'peeing out all your vitamins' or “creating expensive urine” as some would lead you to believe. When you see you urine turning yellow it just means that the flavins in riboflavin are doing their job in metabolizing carbs, protein, and fat. This effect from riboflavin is completely normal and harmless.