Was tested for Rheumatoid arthritis and part of the blood work involved vitamin D, I barely had trace amounts in my blood, I questioned the results as it was summer and I spend is much time as I can outside, the Rheumatologist said unless you live south of a line drawn cross country using the southern state border of Iowa your body won't produce vitamin D like it should the long winters stunt production. I asked another Dr. for his opinion he said that was bullshit and vitamin supplementation does nothing. I went the vitamin route
I live right along that line, in Illinois. Can verify, I spend a lot of time outside in summer, take D3K2, and increase amount on days I can't get out, and over winter. Unlike many things I take, I do notice a difference, feeling less sluggish and moody when I get enough.
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