The principle of subsidiarity was introduced into the primary sources of EU law by the Maastricht Treaty in 1992. as a norm of general application. in order to determine whether the Union can take action in areas that do not fall under its exclusive competence. that is in areas that could be governed both by the acts of the EU and that of the member states. https://parisnaturalfoodes.shop/product-category/kukui-nut-body-oil/