Kat, this is from a newspaper article
http://www.guardian.co.uk/science/blog/2008/aug/12/sexsellsbutfearand
Like Poemsgalore (Kath) says no particular food/drink will boost white blood cell count, as chemo affects these cells in the bone marrow and there's not much we can do about it. Taking care to avoid picking up an infection when on chemo is the important thing, like keeping away from people who have infections. A patient's neutrophils can get very low even so, due to the chemo's effects, which is why the docs do regular blood tests to monitor counts.
I love honey, but I don't think I'd pay a lot of money for a brand which purports to help cancer patients boost white blood cells, without solid scientific evidence.
Jen