I take 2000 units of vitamin D daily. I have my bloodwork once a year and the vitamin D level is now normal andI think my immune system has improved as I no longer seem to get any colds etc. I think it is important to take a good quality product AND to have the bloodtest. Vitamin D is involved with hormones and breat cancer as well. It is not easy to get the required amount from sun alone. I live in the high desert in Mexico and still tested low until I supplemented.
These things can be complex; luckily I have an outstanding female MD that I work with.
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