Which Statement About Dietary Supplements Is False

Which statement about dietary supplements is false?.

A) The effective compounds in all common herbal remedies have been identified.
B) Unlike drugs, dietary supplements do not need to be approved by the FDA before they are marketed.
C) Based on recent analyses of herbal products, their labels are often misleading in terms of the species and dosage of herb provided.
D) Growing conditions for the plants used can influence the chemical composition of an herbal product.