Inconsistency in number of days' supply for Biotest supplements

First of all, I use several Biotest supplements daily, and I have nothing bad to say about their effectiveness. The biggest problem I have is that a bottle of one supplement is X days’ supply when taken as directed, the next supplement is Y days’ supply, the third supplement is Z days’ supply, and so on.

I try to buy in bulk and stock up, but it’s annoying when 3 months’ supply is 4 1/2 bottles of Rez-V, 3 bottles of ZMA, 2 bottles of Curcumin… You get the picture. Is there any reason for this lack of standardization?

I believe this has been addressed in the past on the Biotest forum. It’s best if you re-post your question in the Biotest Supplement Advice forum.