Tag: Excess riboflavin

A Tolerable Upper Intake Level (UL) has not been established for riboflavin, or vitamin B2, because no toxic level has been observed from food or long-term high-dose supplements. This means there is no official daily limit for riboflavin.

Did you know that taking very high doses of riboflavin, or Vitamin B2, has not shown toxic effects in humans? Because it is a water-soluble vitamin, your body absorbs what it needs and safely excretes any excess, though some mild side effects can occur if you take too much riboflavin from supplements.

Unlike fat-soluble vitamins, excess vitamin B2 is efficiently excreted from the body through urine, making toxicity from food sources highly unlikely. This raises the question: can too much vitamin B2 be harmful, and what are the actual risks associated with high supplemental doses?