B12 has a very low toxicity, so large amounts are not considered dangerous
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Chronic treatment should be with an oral B12 preparation
Others choose injections because they want a structured appointment and clearer guidance rather than buying multiple supplements without knowing what is right for them
If tiredness is caused by poor sleep, stress, anaemia from another cause, thyroid problems, depression or another condition, B12 may not solve it
Anecdotal reports from informed users suggest some benefit, particularly for targeting stubborn fat in people who are already reasonably lean