As I understand it, the FDA requires labeling with specific information for food and supplement products in most cases, and steep potential penalties for "misbranding" if required information is missing from the label. When food is sold in bulk in grocery stores, the required information is (in my experience) posted on or near the bin. However, I have seen cases in which bulk food or supplement products are sold online and arrive in simple ziploc bags or other unlabeled packaging. Provided that required label information is given in the online product listing, is this legal? Or are these vendors skirting FDA regulations?
In other words, what counts as a "label" for the purpose of FDA labeling requirements? Could it be e.g. the product page on an e-commerce platform?