The research Dr Wright refers might be: Mauro GL, Martorana U,...

The research Dr Wright refers might be:
Mauro GL, Martorana U, et al. "Vitamin B12 in low back pain: a randomised, double-blind, placebo-controlled study." Eur Rev Med Pharmacol Sci 2000; 4(3): 53-58.
My sister-in-law asked her Dr for the treatment some years ago. But he was not prepared to do it until " the AMA approves it."
http://nutritionandhealing.com/2009/04/29/soothing-sciatica/
　
Soothing sciatica

Q: I’ve always assumed there was nothing that could be done for sciatica pain. It comes and goes for me. I try to do exercises to strengthen the area when the pain isn’t too bad, but I don’t think it’s doing much good. Do you know of something I could try?
Dr. Wright: There is a treatment for sciatica pain that many Tahoma Clinic patients have reported using with great results: daily injections of 100 milligrams of vitamin B1 and 1,000 micrograms of B12. Eventually the dose is tapered down according to the patient’s response.
It’s not a cure that works 100 percent of the time, but most people who try it do get relief. There’s even a study that backs up my clinical experience. It clearly showed that this simple therapy works, even though most patients with sciatica don’t have deficiency in B vitamins.
Of course, I’m not discouraging regular exercises and building and maintaining your strength. But it’s good to know there’s a treatment that may relieve your pain when your sciatica becomes more acute.