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There's a research that winter sunlight in northern latitudes just does not convert precursors to vitamin D. Even when it's shining, no matter how long you are
by rini17 9mo ago
There's a research that winter sunlight in northern latitudes just does not convert precursors to vitamin D. Even when it's shining, no matter how long you are outside.
- 7952 9mo agoAnd I guess you need uncovered skin which can be tricky in a cold winter.