Vitamin D: modulatory effects on the aging immune system Among numerous pleiotropic physiological effects, calcitriol and its structural analogues are known to play a downright important role concerning immune reactions which have been described in an epidemiologic context correlating low vitamin D status and the occurrence of autoimmune as well as inflammatory diseases including, for example, Hashimoto thyroiditis, multiple sclerosis or inflammatory bowel disease, with higher prevalences in northern countries with decreased vitamin D synthesis [147, 158,159,160]
Park-Min KH
But biology is complex
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Why B12 Shots are Better than Oral Supplements While oral B12 supplements can work for many people, there are several reasons why B12 methylcobalamin injections might be a superior choice for others
The most common side effects include nausea, vomiting, constipation, and diarrhoea