What does it mean when a products formula is listed in the Supplement Facts Box as a “Proprietary Blend”? What does that listing tell me?
The FDA’s dietary supplement labeling regulations – at 21 C.F.R. 101.36(c) – permit a dietary supplement manufacturer to designate a product’s formula that is a trade secret as a “Proprietary Blend.” But even though the formula is a trade secret, the manufacturer still must include the following information in the Supplement Facts Box: (1) how much of the product is in one serving, (2) a list of each ingredient in one serving, and (3) the ingredients must be listed in descending order according to the weight of each ingredient in the serving.
