I’ve been taking 4000iu a day for a couple of years. I typically don’t take any when I can get sufficient doses through exposure from sunlight (when the sun is 30 degrees or more above the horizon). There are papers that state you ‘may’ get VDT(Vitamin D Toxicity) through mega doses of Vitamin D (1). Other research infers that VDT is rare, happening only if the person gets massive doses, “Vitamin D intoxication associated with hypercalcemia, hyperphosphatemia, and suppressed parathyroid hormone level is typically seen in patients who are receiving massive doses of vitamin D in the range of 50,000 to 1 million IU/d for several months to years” (2).
The benefits of taking Vitamin D supplements are well documented. There is strong evidence showing Vitamin D supports the immune system (3). If you are deficient in Vitamin D, the rate at which you may experience major complications with a COVID-19 infection is higher than people who have adequate levels of Vitamin D (4).
So, are you supplementing with Vitamin D?
(1) Vitamin D Toxicity–A Clinical Perspective https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6158375/ (2) Vitamin
(2) D – Not as toxic as Once Thought https://www.mayoclinicproceedings.org/article/S0025-6196(15)00244-X/pdf
(3) Vitamin D and the Immune System https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3166406/
(4) Vitamin D Levels Appear to Play Role in COVID-19 Mortality Rates https://www.sciencedaily.com/releases/2020/05/200507121353.htm
Vitamin D (1): https://cle.clinic/31s8lms
Vitamin D (2): https://bit.ly/2NZMDmu
Vitamin D (3): https://bit.ly/3sxJbOS
Vitamin D (4): https://bit.ly/3suIuWQ
[this is an abbreviated blog post]