So OP this is your father? Is he taking Statin drugs, and if so this is a major cause of Neuropathy and also diabetes and alcohol and surgery and and and so many things.

I won't tell anyone to get off their drugs, but I'd sure look into alternatives to replace some if I could, good to talk to doc about this but I do all my own work and I'm 82 this year.

For me and I was left with neuropathy after hip replacement going on 10 yrs ago, Inosine supplement has worked good for me. Also I love love Topricin homeopathic lotion for neuropathy. I have tried so many things over a lot of years and come back to the best being Inosine and Topricin and it comes in foot pain version and regular version, both are fine for all this type pain and misery.

When you say snake oil I can say that about many damaging drugs people are taking and doing poorly. I take 95% supplements for my long health program. There are alternatives for just about every drug out there. Do your homework and research. Good luck.