Kosher, except for Pesach
Description: Riboflavin (Vitamin B2), formerly called lactoflavin (Vitamin G) (food colouring)
Function: food colouring
Rationale:
OU/Star-K note riboflavin is a fermentation product whose growth medium may include chametz-derived nutrients, hence a Passover concern even though kosher year-round.
If you don't see a status above, it does not mean the additive is not kosher automatically - it might just not be documented in our database yet.