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Deficiency may result from several things including: Pernicious anaemia where your body cannot absorb B12 efficiently from food Diets low in B12-rich foods Certain medications, including some contraceptive pills, that interfere with absorption Low B12 levels can manifest in several ways, and many of these symptoms directly affect hair health
Hair thinning Some GLP-1 users report hair thinning during aggressive weight loss phases
Study Design: A literature review analyzing mechanisms, clinical applications, and limitations of natural products in nasal delivery
For individuals following a plant-based or vegetarian diet, B12 IM injections may be a preferred method of supplementation, as plant foods do not naturally contain significant amounts of B12
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