For the record, my back pain was greatly exacerbated by my abysmally LOW Vitamin-D levels (46.5 nmol/L with a low threshold of 75).
I could no longer do squats, ride bicycle, motorbike, in the mornings I would wake up with back pain so bad I couldn’t even wash my teeth over the sink or discs in my back would literally skip (brutal sharp pain which I hope you don’t experience).
I’ve been taking 4000-6000 IU for several weeks now and my back pain is almost a thing of the past… only thing I noticed is my nipples have gotten a bit more puffy, so my Free T & Estrogen have probably increased from it. Mood is also better on average.
Pretty crazy how different everyone reacts to things.