Although it may feel concerning to see bright yellow urine, the change in color is due to B vitamins, particularly B2 (Riboflavin). Your body is excreting what it doesn’t need, but keep in mind that this doesn’t mean you’re not absorbing it. Needed uses nutrient forms that are most easily absorbed by the body, but because they set dosages that are fully supportive, the nutrient amounts may sometimes be more than you need. This is not harmful in any way, but can help you hit optimal amounts. Offering less in order to avoid this change in urine color is not the best strategy when it comes to optimal nourishment.