This paper reviews efforts by various organizations to develop princip
les and procedures for the safety evaluation of flavouring substances;
Critical factors considered in safety evaluation of these substances
include their level of human,intake, ease of metabolism to innocuous e
nd-products and the margin of safety between no-observed-effect levels
in animal studies and human intakes. These factors form the basis for
the principles and criteria laid out in this paper. (C) 1998 Elsevier
Science Ltd. All rights reserved.