Substantial Evidence refers to evidence that a reasonable mind could accept as adequate to support a conclusion.
It also refers to the product of adequately controlled investigations, including clinical studies, carried out by qualified experts that establish the effectiveness of a drug under FSA regulations. 21 USCA § 355(e).
Substantial evidence is defined as "more than a scintilla but less than preponderance," and consists of "such relevant evidence as a reasonable person would accept as adequate to support a conclusion." Mareno v. Apfel, 1999 U.S. Dist. LEXIS 8575 (S.D. Ala. Apr. 8, 1999)