B. When and What You Must Do To Comply With the New Regulation.When does this rule become effective?The rule became effective on February 7, 2000, for any products marketed for the first time after publication of the final rule or for any new claims made for an existing product after publication of the final rule (i.e., new claims made after January 6, 2000).If I have existing inventory, do I need to re-label it now?Large businesses had until January 7, 2001, to bring existing claims on products into compliance. FDA granted this period for firms to use up their label inventories. Small businesses had until July 7, 2001, to bring existing claims on products into compliance. Any existing inventory not used up after these dates would need to be relabeled.