I've been told by some practitioners to avoid taking B vitamins while treating parasites. See Biamonte website at: www.health-truth.com/. He talks initially about candida but he also covers all pathogens.
Many of the bugs (bacteria as well as parasites) are serotonin feeding neurotoxins. Methionine is the precursor to serotonin. For those of you who have done a urine organic acid test, you may well find high 5HIAA excretion and low serotonin on other neuro panels. This indicates that the bugs are using the available serotonin and excreting its metabolite which is 5HAII (some endocrine tumors do the same thing). On the other hand Paromomycin depletes folate and makes it unavailable to the organism. So there appears to be different methods of starving the bugs of their needed nutrients. Unfortunately, this strategy will also deplete the host of the very same nutrients and cause all kinds of havoc. I don't think that we should all stop taking needed nutrients in an effort to starve these critters and be on certain drugs that also deplete our reserves of nutrients. For one, we are all nutritionally deprived with these infections and secondly, we'd all go stark raving bonkers without B vitamins and key amino acids. Plus the bugs will win this contest hands down before we cave in.