40Furthermore, since Article 30 EC provides for an exception, to be interpreted strictly, to the rule of free movement of goods within the Community, it is for the national authorities which invoke it to show in each case, in the light of national nutritional habits and in the light of the results of international scientific research, that their rules are necessary to give effective protection to the interests referred to in that provision and, in particular, that the marketing of the products in question poses a real risk to public health (see to that effect Sandoz, paragraph 22, Case 227/82 Van Bennekom [1983] ECR 3883, paragraph 40, and Commission v Denmark, paragraph 46).
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