hi there, good to see this update! any possibility of actual results, including units? experience has taught me to be quite suspicious of 'good' results and if your d3 levels are low after months on a supplement, then real magnesium and zinc numbers are even more important..
when the spine is going wonky, hydration is very important - spinal discs don't have the greatest blood supply, and proper hydration can help (see links below).
can't back this next bit up with science, but i have used the niacin flush in the past to accelerate oxygen and nutrient delivery to tissue. one could hope that the blood supply to the spinal discs would also benefit from the transient flush induced by straight niacin (ie not niacinamide). nb. if you don't flush in response to a reasonbly hefty dose of niacin, it can mean fatty acid problems..
links i have found to be useful/informative in the past, re spinal nutrition and hydration:
Degenerative Disc Diseasehttp://www.chirogeek.com/001_Degenerati ... isease.htm
brief quote follows - click through to the URL above for far more detailed info
"There are two main factors that are involved in the aging process of the disc and both of these factors are amplified because of the already poor vascular supply of the disc:
1) Idiopathic blood vessel/nutrient loss and dehydration
2) Non-Enzymatic Glycation & the aging process: Glycosylation (aka: Glycation)"