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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

Information here is drawn from published research and regulatory documents

While many factors, including stress, diet, and exercise, can temporarily affect your menstrual cycle, it's always a good idea to consult a healthcare professional if you consistently experience missed or infrequent periods, especially if these symptoms are accompanied by other concerning changes

So vitamin B12 injections are very effective