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Persistent fatigue, brain fog, low mood, weight gain, tingling in the hands or feet, frequent illness, post-COVID fatigue, or feeling generally "off" despite eating well and sleeping enough, especially if you're vegetarian, vegan, over 50, on metformin or a long-term acid reflux medication, or have a history of low B12 or pernicious anemia
2009;5(3):e1000324 10
The pen contains a clear and colourless or almost colourless solution
It does not tell you when to stop
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