It's been suggested here that grape seed extract helps prevent spread. I'm not certain if it does or not but it does seem as though it might. I take some other things which I'm more sure help me. Ghinko biloba helps significantly and vitamin C also seems to help (and ward off colds). Some pharmacists have suggested that all the antioxidants might help and I'll try adding some more to see.

Probably the best thing to remember is to fight the disease and not the foot. But who knows?

Good luck.