Earlier quoted context omitted.
I hacked this with Vitamin D supplements.
How much do you take, and does it really work ? Any secondary effect?
I try to take 10-15,000 IU (of D3 in gel cap) two to three times a week. Yes, it really works in that my blood testing showed the difference. I have seen no side effects, but then I was really, really deficient.
One side benefit: No more symptoms associated with Seasonal Affective Disorder.
YMMV.