Ayurvedic preparations should be of international standards if it no longer had to be perceived as a mere food additive, accoding to Dr H Wagner, a German scientist specialising in phytomedicine. Delivering a lecture on "Phytomedicine 2000 in Germany and Europe" at the international conference on "Update Ayurveda 98" here yesterday, Mr Wagner said many of the Indian companies were exporting several Ayurvedic preparations as food additives as they did not demand stringent quality control.