Why can't Zhenshandao brand bee products be seen in the market?

Only do online sales. Zhenshandao official website shows that it is only sold online, so its products are not available in the market. Zhenshandao brand propolis capsule is reliable. Has the functions of enhancing immunity and regulating blood sugar. Its main component is total flavonoids, which has the function of regulating blood pressure, blood sugar and blood lipid.