Just interested in hearing from anyone here who gets strange side effects from Vitamin D.It is the most confusing thing for me. If I take even 1,000 IU of Vitamin D, within 5 hours I will be so unbelievably exhausted that I just want to go to sleep. Within 24 hours, I develop aching and "pinching" and stabbing sensations in my groin glands, neck glands, or armpit glands. This time around its my groin gland. The very gland that was swollen the week before my BFS started. That was my first symptom. My left calf which was fully knotted up for 4 months when my BFS was at its worst, also begins to tighten up again very uncomfortably. One other guy on here who I correspond with regularly reports inflammatory reactions as well. For him its increased twitching, muscle cramps, pains, etc. If he wants to chime in here and go into more detail, go for it. Its a very strange thing for me, because Vitamin D is supposed to suppress immune inflammation, but its obvious to me its increasing my immune system (or other) inflammation noticeably. To the point that I can regress back into my non-twitching BFS symptoms within 24 hours, after months of being 100% cured. I am just worried about having my Vitamin D levels too low (I hover around 30 naturally), so I feel like I need to be taking it. -B-