Vitamins are fine. I'd be careful mixing the St. John's Wort and Phentermine. SJW seems to interact with lots of drugs - I know when I looked into it, I found out that it reduced the effectiveness of birth control pills drastically. Anyways, this article doesn't recommend it.
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But we can safely assume that any substance like St. John's wort that works on neurotransmitter levels of the brain, particularly serotonin, is going to have an interaction with similar acting drugs.
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http://www.findarticles.com/p/articl...21/ai_18878075
I'm sure you could ask your pharmacist. I think they have sources for looking up herb-drug interactions.
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