I’m sorry but none of that means a thing, the fact is that Vitamin D3 can be taken in high doses for a while by some people and be safe, and taking k2 makes it safer as does taking Magnesium.
I am not saying that dosing oneself with 50,000IU of vitamin D should be done lightly.
Ideally you should first check your levels, also consider if you are going to get vitamin D from the sun.
Next you should ABSOLUTELY take at least the K2 the study mentions and also a bioavailable form of magnesium.
Then you should try it for just 3 months only, the period in the study for some participants (some did 6) but all apparently gained length in 3 months.
You should watch out for the symptoms of too much Calcium, and ideally be tested at least mid-way through the study for Calcium and Vit D levels.
That all 14 members of the study survived for 3 months and others were okay for 6, then we can assume the odds of death if you are careful aren’t overly high or there would have been at least one death.
Based on the fact that people have to take 50,000IU for an extended period to have problems normally or be sensitive to vit D overload, 3 months should be fine probably following the precautions, but do so at your own risk.
There have been studies with people taking 50000 and 60000 IU for longer than 3 months and all were ok, but they were all deficient in vit D, but most people are by many estimates.
If you are a nervous person then don’t do it obviously, and don’t do it at that level if you have been supplementing with say 5-10k of vitamin D3 a day for some period.
But if you are overweight, your levels are all the more likely to be low.
~1997 age 18 I was 4.7" BPEL and somehow grew either because I wasn't done growing and or some PE work to a bit under 6 inches without measuring or noticing progress at the time. Girth has always been about 6 inches but is slowly getting larger 6.2" at widest
Current BPEL after a little work is 6.2" also, Bone pressed stretched flaccid 6.5" Will update with gains.