Comments by "Mark Pawelek" (@mark4asp) on "Dr. John Campbell" channel.

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  4. No. I would take the maximum allowed in UK, which is 4000 IU per day. 1000 ng = 1 µg = 40 IU 1000 µg = 1 mg A safe dose of vitamin D leads to a blood level above 50 ng/mL in blood. Any level above 50 ng/mL and below 150 ng/mL of vitamin D is considered safe. Vitamin D exists is 3 forms. It is stored in fat cells. Vitamin D3, from fat, or sunlight, is converted to the active vitamin D form in the kidneys. Vitamin D3 is the normal form found in pills and capsules. A recent study found that, after several months, of a dose of 20000 IU per day, people still had blood levels below 100 ng/mL of vitamin D. None of them developed Vitamin D toxicity symptoms. Everyone in UK should take at least 4000 IU/day. It's a good idea to take vitamin K2 with the vitamin D. Taking vitamin K2 with vitamin D3 helps to ensure the calcium transported by the vitamin D is absorbed by your bones where it's needed Vitamin D toxicity? Only ever seen with truly massive vitamin D doses! "In the 1940s, vitamin D was thought to be effective for treating rheumatoid arthritis and massive doses of 200,000 to 300,000 IU/day were given. It was soon realized that these massive doses resulted in vitamin D intoxication, including hypercalcemia, hyperphosphatemia, nephrocalcinosis, kidney stones, and soft tissue calcifications." Read: Holick, M. F. (2015). "Vitamin D Is Not as Toxic as Was Once Thought: A Historical and an Up-to-Date Perspective". Mayo Clinic Proceedings, 90(5), 561–564. doi:10.1016/j.mayocp.2015.03.015 https://www.mayoclinicproceedings.org/article/S0025-6196(15)00244-X/fulltext
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