The thing nobody ever tells you when you're taking LOTS of Vitamin D (and 5000 IU is not a lot by any means once you've researched it) is that you have to offset the D3 with vitamin K2.
I personally supplement with 50,000 IU per day of D3 and have a blood level that hovers around 105ng/ml which is in my personal comfort zone after research. I also take 1.2mg of K2 to keep the calcium headed to my bones and not my soft tissues or kidneys. Blood work looks good and Dr. is happy with all other metrics.
Research Jeff Bowles for high-dose D3 therapy, and there are several articles on Nexus Magazine as well (not tainted by US MSM or mainstream medical salesmanship). Make your own decisions regarding your health!