I took 5000-6000 IU every day for 6 months or more then had a blood test done in August 2017 I believe, and my levels were 120 nmol/L (that's like 48 ng/dl normal/good range according to test 51-250 nmol/L). My sun exposure during that summer was low but still was outside like an hour every day being in the sun with bare arms and neck. So considering that I don't think my levels would suddenly become very much higher than that.
So it is not a "super dose" in my case, now if you are much more sun exposed or eat peculiar diets then yeah 5000 IU might be a lot.
I have been sticking to 5000 IU / day since then, but recently taking every Monday 35000 IU. Since I have no intentions of sunbathing and looking like a tomato, it's quite natural for me to think to myself that pills are the same as sun exposure and so forth....
My vitamin D3 supplementation coincided with some significant health gains, such as less allergies and breathing problems, doubling of testicular volume within ~6 months at age ~23 when I started taking 2000-3000 IU D3 fairly consistently and increased my caloric intake (this was 2015 or so). Probably generally felt better too, but of course my situation might be confounded by a few things like having had quit benzodiazepines in 2012 and experiencing some significant problems with that for a long time, and so on. But the breathing and allergy thing seems like the most likely to be related to vitamin-D levels, just from what I've read. Whereas testicular volume maybe is more about just calories and overall nutrients and perhaps something to do with the benzodiazepines (or withdrawal from them) interfering with hormonal regulation, as well as natural growth (albeit weirdly fast). D3 is what I've been supplementing most consistently and so it seems likely it has done some good, unlike most all the more sporadic supps I've taken. (I did take resveratrol for a while that's the only other candidate I think might've have had something to do with the testicular growth, but I only took like half a gram for 6 months, and then quit it. So if it had something to do with that it was more akin to a reboot of the system, sort of like PCT for Anabolic Androgenic steroid users to get their system up online again, to make a loose comparison.)
The calcium issue is something I was very interested in long ago but I couldn't find too much about it that seemed too certain, and all the different forms of vitamin K made it more confusing. My plan now is to eat a bunch of Kale and various foods to get a good amount of K from. I do think I am genetically predisposed to calcification of soft tissue (everyone is I suppose but I mean to the point where you really notice it like with my dad), so I'll certainly try and read some more about K.
Edited by Keizo, 16 July 2019 - 06:24 PM.