The jury is still out on the viability of this 'tip' but instead of looking high and low for a vitamin supplement/root stimulant here in my neck of the woods, I've started crushing 2-3 human B-12 tablets and mixing the powder in a gallon of clear water. You may then strain the mix if its to be used as a spray, or you can use as is for a drench/dip. Couldn't hurt!
Tony