Last I checked it's an herb
From your own post---
1. What are dietary supplements?
In the U.S., the Dietary Supplement Health and Education Act (DSHEA, Public law 103-417, October 25, 1994, 103rd Congress) defines a dietary supplement (DS) product as
"a product (other than tobacco) intended to supplement the diet that bears or contains one or more of the following dietary ingredients: a vitamin, a mineral, an amino acid, an herb or other botanical; or a dietary substance for use to supplement the diet by increasing the total dietary intake; or a concentrate, a metabolite, a constituent, an extract, or a combination of any ingredient described above; and intended for ingestion in the form of a capsule, powder, softgel, or gelcap, and not represented as a conventional food or as a sole item of a meal or the diet."