"In medical world, Buyers Club is a club organized to pool members' collective buying power, enabling them to make purchases at lower prices than are generally available, or to purchase medicine that might be difficult to obtain independently (i.e AIDS Buyers Club). Usually, it was sold in the form of membership/subscription.
However, medicine given by the buyers club are not based on the authorization/prescription of a doctor or might not be approved by the local government. However, buyers clubs are not illegal since they didn't sell medicine, but they sell membership as their businesses model. Therefore, as long as possession of the said drugs are not illegal, it is allowed to be given by buyers club"