Classification of food and pharmaceutical products are different. In the proper use of pharmaceutical products, it is essential for a medical consumer to receive the drug information about effectiveness, safety and quality of it. On the other hand, since legal classification between medicines and dietary supplements was based theircultures,theclassificationofeachdrugisdifferentineachcountry.Melatoninisahormoneproducedbythe

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... ormationofJapanandthe United States by using Internet search mainly and investigated the relationship between amount of product information and product classification. Melatonin is classified as a dietary supplement in the United States, the productinformationofefficacyandsafetyisdisplayedas"SupplementFacts"andtheuseofmelatonininchildren is not recommended. On the other hand, melatonin is classified as a pharmaceutical product in Japan, but is not produced in Japan. Therefore, it is difficult to have it for Japanese customers, and then they personally import using the Internet with their self-responsibility. However it is difficult to obtain its appropriate information for consumers,becauseoftheregulationofthePharmaceuticalAffairsLaw.Ithasbeenreportedthatthepoisoning accidentbytheexcessiveintakeofmelatoninalready.Itwillincreasetheriskofthehealthproblemtopurchase melatoninthroughtheInternetmore.Therefore,weconcludedthatInternetpurchaseofMedicineshadahighrisk forJapanesecustomerssincetherewasnotsufficientdruginformation.