Because you are NOT getting the correct wavelength of sunlight to "activate" the vitamin d you are taking. The pill you are taking is not the same as the kind thats created when you get UVB rays from the sun. Best UVB rays come out around noon. Start getting some.
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I'm housebound I can't walk very far plus have other health problems, I get out when I can
Figure out a way to get outside. Open a window. You need real sunlight. Do it for a month.
I ask going to really try once the sun comes out , we are busy having a lot of rain