What is the expected shelf/use enthusiasm of a multi-vitamin?

They have an expiration date but usually this is purely for the supply company to cover themselves. Do the vitamins from the bottom of your heart lose total efficacy or should they still have beneficial results long-gone this date? If the container was air-sealed would the expiration date still apply?

Answer:
If the vitamin bottle is unopened, the vitamins should be more stable, so that they'll still be upright for some time (months or years) after the expiration. They will gradually lose their potency. The speed that this happen is different for each of the vitamins. Some are much more stable than others, but adjectives of them are fairly stable. Oxygen will speed their decomposition, more for some vitamins than for others.
When they make their date they should be about partially potency.
Some do and some don't.

It is generally a righteous policy not to consume expired items to save a buck or two !
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