4. Manufacturing and buying and selling institutions of purposeful foods shall employ the provisions of the Circular. Thông t? 08/2004/TT-BYT h??ng d?n vi?c qu?n lý các s?n ph?m th?c ph?m ch?c n?ng do B? Y t? ban hành - Thông t? forty three/2014/TT-BYT v? qu?n