After watching for a while it becomes clear that it only uses and provides the bonus from the highest tier of medical supplies provided but at a glance one could think it is cumulative. The info text on the clinic also does not provide clarification in regards to that matter. As whole it was enough to leading me to believe that I need to provide both tiers at first, building accordingly, thinking it works like Construction Parts and not like Lab Equipment.
Setting the amount used per month to 0 for lower tiers when higher tiers are present would provide clarification as would a better info text. The consumption rates are variable based on active disease anyway. [1] The fact that two different medical supplies can be selected at once analogue to the food market also adds to the confusion.
[1] More info on how diseases affect consumption rates and how/when disease occur would be nice too. Currently its just guessing and hoping overproduction and stockpile size is sufficient.
