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Reference ranges and units vary between laboratories some report in ng/L (nanograms per litre) and others in pmol/L (picomoles per litre) so results should always be interpreted using your local laboratory's reference intervals and in the context of your symptoms and clinical history, rather than against fixed universal thresholds
Phrases like where can i buy b12 injections online and b12 injectable buy online are typed thousands of times a month, usually by someone hoping to skip the consultation entirely
The current NICE guidance on B12 and folate deficiency sets this out clearly
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