A deficiency of riboflavin can be primary - poor vitamin sources in one's daily diet - or secondary, which may be a result of conditions that affect absorption in the intestine, the body not being able to use the vitamin, or an increase in the excretion of the vitamin from the body.
Substantial evidence means more than a mere scintilla. It means such relevant evidence as a reasonable mind might accept as adequate to support a conclusion.. Richardson v. Perales, 402 U.S. 389, 401 (1971).
Relevant evidence, therefore, is evidence that is logically connected to the fact it is intended to establish (Blackwell, 2004). Other forms of the word, such as relevance and relevancy, are often used interchangeably to refer to evidence that is to be considered for admission in a case.