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The northern latitude in North Dakota and Minnesota mean that during the winter, the sun’s rays are so weak that they don’t allow people to make vitamin D, increasing the risk of deficiency.

North dakotaUnited statesSan franciscoBonnie vangerudWilliam grantBeth sanfordVeterans affairsNational academy of sciencesRasmussen university in fargoGrassrootshealth nutrient research instituteSanford medical centerNational academyNorth dakota vitamind projectRasmussen universityNorthern plainsVitamin d