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You're asking for trouble here. Chickens have VERY different vitamin/mineral needs than humans do.
What do you mean by "not normal human vitamins"?
I'm very worried for your bird...
I have to agree, they are not interchangeable no matter how not normal they are. Head for the feed store and get some vitamins specifically for poultry, they aren't very expensive, and since you can mix them in the water, MUCH easier to administer.
If you'd like, post more details of your chicken's illness, there's a good chance we can diagnose it and tell you what will help.