Vitamin D - What are Optimal (healthy) Levels?

Whenever you are addressing a health issue: "Normal" is not necessarily "Healthy". Always find out what is "Optimal" and go for that and settle for nothing less

When interpreting Lab test results for Vitamin D:
Optimal 25-hydroxy vitamin D values are:

• 45-50 ng/ml or 115-128 nmol/l

Normal 25-hydroxy vitamin D lab values are:

• 20-56 ng/ml 50-140 nmol/l

Your vitamin D levels should NEVER be below 32 ng/ml, or the equivalent in nmol/l. Any levels below 20 ng/ml are considered serious defiency states and will increase your risk of breast and prostate cancer, osteoporosis and autoimmune diseases like MS and rheumatoid arthritis - to name a few.
(Reference: Holick MF. Calcium and Vitamin D. Diagnostics and Therapeutics. Clin Lab Med. 2000 Sep;20(3):569-90)