How many people will need to be paid to operate this free supply chain to provide a good that is perfectly well-supplied inexpensively privately now? How many to answer questions, field calls about missed shipments, lost pills, changes of address, etc?

The answer to every problem shouldn’t be “create a new government-funded agency to make this happen ‘for free’”. Mr Market isn’t the answer for every single thing, but sometimes it’s fine to let existing private supply chains operate. Supplying cheap dietary supplements seems to me like an area where that’s the case.

It may need to be added to SNAP/WIC; that’s a reasonable task for government to busy itself supporting this.