Typically, when I get a cold, I end up coughing all night. My lungs just feel incredibly itchy even if I take nyquil, benadryl, inhaler, nebulizer, montelukast, etc. I just end up coughing in a drugged stupor, and my wife won't get any sleep for about 2 weeks either. So part of my excitement is part of hers too as she's a lot less cranky than previously when I got sick.
Clarifying that when D3 != D2. D2 is what doctors prescribe. Also D2 is what's in soylent type meals. D2 decreases D/D3 increases D
https://www.ncbi.nlm.nih.gov/pubmed/24001747
https://www.ncbi.nlm.nih.gov/pubmed/22552031
Long Term Upper Limit Daily ~= 10000 IU
https://www.ncbi.nlm.nih.gov/pubmed/17209171
Take it with a meal
https://www.ncbi.nlm.nih.gov/pubmed/20200983
My basic routine is to take 5000 IU D3/K2 + 100 mg magnesium citrate/100 mg magnesium glycinate + fish oil at the same time with a meal that includes fat once daily. It's not as much as it seems since my D3/k2 are combined with each other and the magnesium supplement contains the two forms.
When I am sick, I double it (take it again at another meal). And when I wake up in the middle of the night I toast a bread with butter on it and take the above without the fish oil and it's enough to help me sleep again. This is without using any meds.
I'm not a doctor though! There are many factors that will boost/reduce your need for vit D or amplify the vit D, weight/obesity, soda, genes (some people are missing receptors), k2, boron, drugs, etc. the list is endless, and they're all varying amounts (10%-?200%) You can google these on the nih database. Many of these factors can also be thin/broad and steep/shallow U/J shaped curves to add to the complexity. So I suspect that my needs will probably be different from yours.
But the most exciting thing is this reduction in mortality!
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4196486/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4196486/figure/fig2/