I heard yesterday from my daughter-in-law that my grandson, who suffers from PoTS, had had blood tests done. She said "these show that he has extremely low vitamin D so is starting vitamins this week. I think his new doctor is hoping this may help relieve some tiredness and aches." I sent her this video
youtube.com/watch?v=U3W84wb...
which I watched. I was interested that John Campbell didn't have much time for Adcal. I had reached the same opinion and stopped taking it.
He also talked about K2 and I thought I must get them, looked it up on Amazon and found that I bought some last month. Then I remembered that I had side effects, which may or may not have been the result of the K2, so thought I'd try them again. I can't remember what these side effects were so we shall see!
I also worked out that maybe 200mcg could be too much so I will cut each tablet in half.
My vit D level is now 152 nmol/L, thanks to this forum.