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The relevance of these findings to humans is not established, and this is not classified as a formal contraindication in UK or EU labelling (unlike in the United States)

Although PPV was considered an attractive strategy for PCa, and even after successful phase II trials, the phase III trial of 310 patients with mCRPC receiving docetaxel found no survival advantage over PBO (HR 1.04

10.1128/mcb.23.7.2362-2378.2003 Mol

If you think that's the case, I have to say that unless you're very lucky in having a GP who knows something about B12 deficiency, you may have to think about adding the extra yourself (sublinguals, patches, drops or self-injecting)