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Cause I live in Glasgow and we get fuck all sunlight here all year, nevermind in the winter!
Here's the article I read about vitD and sporting performance.
It is also official Scottish government advice that people who don't get outside during sunlight hours (this includes me) during the winter months should consider taking 10 micrograms per day
You know how? You've been tested? What was your level?
And what are your levels taking supplements?