Bright yellow urine usually is indicative that someone is supplementing with

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Riboflavin (also known as vitamin B2) can cause bright yellow urine when taken in excess. This is because riboflavin is water-soluble and any excess is excreted in the urine, giving it a yellow color. Niacin can also cause yellow urine, but typically this happens at much higher doses than are typically consumed in a standard dietary supplement. Vitamin A and K do not typically cause changes in urine color.

Bright Yellow Urine Usually Is Indicative That Someone Is Supplementing