The Ministry of Health, Labour and Welfare of Japan, on the other hand, announced their opinion in July 2004 that in view of the arsenic contents in the results of the surveys, the provisional tolerable weekly intake announced by the World Health Organization (WHO) would not be exceeded unless 33 g or more (of dehydrated hijiki, in cases of a 50-kg adult) was regularly taken into per week, and that in view of the current average intake of Japanese people, the health risk was not likely to rise in cases of normal consumption.
一方、日本の厚生労働省は、2004年7月、調査結果のヒ素含有量からすると、継続的に毎週33g以上（水戻しした状態のヒジキ。体重50kgの成人の場合）を摂取しない限り世界保健機関（WHO）の暫定的耐容週間摂取量を上回ることはなく、現在の日本人の平均的摂取量に照らすと、通常の食べ方では健康リスクが高まることはない、との見解を示した。