excess watersoluble vitamins get excreted in urine..dose capsule ur taking ds have different permissible pigments which get mixed to normal urine pigment to play colorgame which is most of the time harmless. unless associated with fever or burning sensation while urination. If blue pigment gets into urine, the color is often green because the blue mixes with the yellow urochrome that's naturally present. It's not an everyday occurrence, but there are case reports of many common medications causing green color urine. so dont worry.