While vitamin supplements may contain elements that are of
nutritional value to plants, they're *expensive*. Pick up a few ounces of
trace element supplement at a hydroponics store. Not only will it be
tailored to plant nutritional needs, it'll be cheaper.

It is also worth noting that unless there is a deficiency, it
won't help the plants grow any better. Trace element nutrition in orchids
is rarely the cause of poor growth- except, perhaps, for iron. The use of
a chelated iron supplement may be of benefit to all orchids- either as
Fe-EDTA, or Fe-EDDHA. Calcium is also occasionally a problem, affecting
the youngest, fastest growing parts of a plant- turning them jet black. A
touch of calcium nitrate or calcium chloride will help.

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Cheers,

-AJHicks
Chandler, AZ