Many OLLY products are NSF Certified, and others are in the evaluation process. NSF certification means that OLLY's products meet strict, independently verified standards for public health protection. NSF evaluates every aspect of the product development process from extensive product testing to manufacturing plant inspections to ensure products and manufacturing processes are following current Good Manufacturing Practice regulations set by the FDA, before it earns NSF certification. Once certified, NSF continues to monitor products and manufacturing activities to ensure they continue to meet the same high standards every time they are made.
Here is a list of OLLY products that are currently certified. Other products are currently being evaluated.