My vitamin D has been as low as 12. I don't feel better with supplements. I have Multiple Chemical Sensitivities with adverse reactions to multiple meds, and I'm afraid to take high dose vitamin D. High doses of some B vitamins have caused bad side effects for a long time, and they're supposed to be water soluble. I saw haloes around lights for a long time after my doctor had me take high dose vitamin B-2 for awhile for migraines. I also believe it caused me to have my first complicated migraine with stroke-like symptoms. it definitely didn't help my migraines, and I ended up in the ER. My vitamin B12 is low, too. I had bad heart arrhythmias and other symptoms for a long time after taking a high dose of B12 sublingually. I think it was 2,500 mcg. I can tolerate 500 mcg. sublingually (8,333% RDA). My doctor wants me to take 1,000 mcg., but I'm afraid to do that. My Ferritin level also runs low. I never feel better taking any vitamins or minerals even when my levels go up some. I've also had kidney stones, and I've read that some vitamins and supplements can cause them. I know I need to take them, and I hope I never get anymore kidney stones. I lost my older half-sister to melanoma, and my younger half-sister has had melanoma, too, so getting vitamin D from a lot of sun isn't an option for me. I'm also very heat intolerant, and I sunburn very easily. I hope you'll be able to get your vitamin D levels up and feel better. My vitamin D has never been anywhere near 80. I believe my vitamin and mineral deficiencies do play a role in my symptoms.