1. 1) The Consumer Commission. (n.d). Survey on Consumers' Use of “Health Food” (Questionnaire survey). https://www.cao.go.jp/consumer/doc/20120605_chousa_houkoku.pdf. (cited December 22, 2020) (in Japanese)
2. 2) Tokyo Metropolitan Government. (n.d.). Report on the results of a survey on the consumption of “health foods” among Tokyo residents. https://www.metro.tokyo.lg.jp/INET/CHOUSA/2016/03/60q3t100.htm. (cited December 22, 2020) (in Japanese)
3. 3) Ministry of Health, Labour, and Welfare. (n.d.) Current situation surrounding health foods. https://www.mhlw.go.jp/shingi/2003/04/s0423-6b2.html. (cited December 22, 2020) (in Japanese)
4. 4) Toda, M., & Uneyama, C. Current Problems Associated with Overseas Health Products. Yakugaku Zasshi, 2018; 138(12): 1531-1536. (in Japanese)
5. 5) Ministry of Health, Labour, and Welfare. (n.d.). Preventing and Expanding Health Damage Caused by Health Food. https://www.mhlw.go.jp/topics/bukyoku/iyaku/syoku-anzen/dl/pamph_healthfood.pdf. (cited December 22, 2020) (in Japanese)