It is very normal to experience bright neon yellow urine a few hours after taking Dr. Tobias Adult Multivitamin.
The neon color comes from one specific B vitamin called riboflavin (B2) which contains flavins - naturally occurring yellow pigments.
Some vitamins (A, D, E and K) are fat-soluble and some are water-soluble (all eight B vitamins and vitamin C). The fat-soluble ones can be stored in your body for future use but the water-soluble ones can’t, so any excess that you don’t need will be excreted in your urine. The water-soluble vitamins need to be replenished every day.