I have sciatica from a herniated disc. So the herniated disc can pinch the sciatic nerve. For over 18 days, the numbness in my calf and foot didn't go away, although the nerve pain was reducing with time. The moment I started taking Alpha Lipoic Acid, I started seeing improvements. The second day of using the numbness started subsiding and I was walking better without limping too much.
There is a great post about Alpha Lipoic Acid in the neuropathy section. I think ALA promotes nerve healing.
I took a pill 0f 300mg in the morning with food and one more at night with food.