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Sunlight interacts with a protein in our skin called 7-DHC, and the result is active vitamin D3, the most common winter vitamin deficiency
Research also suggests that these injections might decrease the risk of dementia and other cognitive impairments, especially in individuals with low B12 levels
Injections bypass that step, so more B12 becomes available to tissues
However, B12 tablets remain a well-established and reliable choice
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