Where do merchants who wholesale tonics generally purchase goods?

See what supplements, if they are supplements with low ordinary value, they are generally purchased from the Chinese herbal medicine market. If it is a tonic with high value and expensive price, it is generally purchased from the place of origin, which can reduce a lot of costs and ensure the authenticity of the goods, such as Cordyceps sinensis. Many merchants choose sellers who directly sell Cordyceps sinensis.