--- http://www.has-sante.fr/portail/display.jsp?id=c_400588 2005 France evaluation of the transparency committee saccharomyces thiazolidine-4-carboxylic acid capsules ultra-levure ultra-levure
--- http://www.has-sante.fr/portail/display.jsp?id=c_399052 2001 France evaluation of the transparency committee powders thiazolidine-4-carboxylic acid ultra-levure saccharomyces ultra-levure