Nux Vomica is the traditional homeopathic remedy for nauseau. Homeopathic remedies are completely safe to use with chemo. No interference whatsoever. Natural products (e.g. herbs, vitamins, etc.) have to be monitored because some them might have negative interactions, but that is the beauty of homeopathy. My experience though is that many/most physicians don't even know what homeopathy is or how it works, so automatically through it into the "natural" category.
Regards,
Craig