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2021 Dec;53(11):e14234
Many UK laboratories now measure holotranscobalamin (active B12)
While B12 supplements benefit those with deficiencies, most people without a deficiency wont see additional benefits from taking extra oral vitamins or injections
That doesnt mean you never have to think about your B12, particularly since a few different factors, like age and gastrointestinal issues, can affect how well we actually absorb the B12 we consume
It is not a substitute for professional diagnosis or treatment
Like any injection, there may be some bruising, redness, and soreness at the injection site.
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