This is a normal occurrence when taking B vitamins. Your urine may become a bolder yellow color due to the riboflavin (vitamin B2) which is water soluble.
If you are concerned about color variations in your urine we suggest you consult with your healthcare provider or functional medicine doctor.
Amy Myers MD® Multivitamins are formulated to ensure that you are able to obtain the Optimal Daily Intake of the vitamins included in the product. You can read more about Optimal Daily Intake On Dr. Myers' BLOG page and that article is linked below: