If your leg starts to feel lazy or some tingling feeling somewhere, you may want to increase your B-complex intake.
My wife leg has started to feel like that.
Besides the usual 3/3/3/3, take an extra tablet once every hour to ensure that you have enough vitamin B in the body. B-complex is water soluble and thus, it doesn't stay in the body. A regular intake will ensure that the body has enough vitamin B to maintain healthy nerve.