TLDR: Vitamin D prevents Death. Not reduces the chance of this or that. But prevents “all cause mortality”. That’s the type of result you want!
- Your doctor can order a “25(OH)D” blood test, and insurance might cover it.
- Vitamin D Council sells test at home kits for under $60.
- D*action is a long term study of Vitamin D and sells at home testing for about $60.
Grassroots Heath recommends 40-60 ng/mL.
Vitamin D Council “suggests that a level of 50 ng/mL is the ideal level to aim for.”
NourishBalanceThrive, 2016-03-21, reviewed research for peak athletic performance to determine 40-50 ng/mL.
Huffington Post 2017-07-29 summarizes the optimal vitamin d blood level to reduce death. Appears to be 40 ng/mL.
Supplement Dosage Recommendations
USA FDA recommends “600 IU/day, 800 IU/day for seniors”
Dr. Horlick recommends “1000 IU of vitamin D a day for children and 2000-3000 IU of vitamin D for adults.”
Linus Pauling Institute recommends 2000 IU.
Vitamin D Council recommends 5000 IU, with the goal of getting blood levels into the 40s.