thanks for the research, billd. 
I would say that I have most certainly noticed the impact of orange juice – far more than apple, or cranberry, or grape juice – on the effectiveness of Adderall XR. I actually find that if I am having trouble sleeping, usually drinking a glass of orange juice at night will resolve my insomnia within an hour or so and I can sleep.
so far, I haven’t found any obvious impact of vitamins on how, or how well Adderall seems to work for me.
of course it is different for everyone, but I would certainly say that OJ breaks down the drug in my system much more quickly, where other juices or vitamins don’t.
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