Calcium/reptivite to old?

[Kimmie]

So I just looked a little at my Repti Calcium which date (to if it is to old) is gone, I was just thinking, can dust calcium/vitamine really become to old?.

Is it less effective or something?, I got 300G in this one left, and I think it is a waste to throw it away if it is not to old, do you guys throw your vitamins/calciums away when the date say it is to old?.

It is maybe a stupid question but I just can't put my mind to think something like that can become to old :/.