Making claims in Japan is a dangerous business if you don't do it right according to Paul Yamaguchi, author of this article at the Natural and Nutritional Products Industry Center.
According to Yamaguchi, in Japan "you are alone in a war zone without protection and the laws are all around you. One slightly wrong move, and you would be fined or in the worst case prosecuted, or both, just because of using a wrong phrase."
Scary stuff. Luckily there are consultants like Paul and his company Japan's Nutraceuticals that can help.
Update: Additional articles by Paul Yamaguchi
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