Out-of-date vitamins

[WF]

I've got some nearly full packets/jars of out-of-date vitamins (just opened, took 2 and then forgot). They're dated:

Complete MultiVits 07/11
Echinacea 12/12

Will they still have retained their nutritional benefit?

Some vitamins deteriorate faster than others vitamin C is gone very quickly.

Probably not - but they won't do you any harm. TBH, you shouldn't need vitamins from tablets anyway though - you should get everything you need if you're eating a balanced diet.