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But if left untreated, it may cause the following symptoms: Weakness, tiredness, or lightheadedness Lack of energy A decline in your mental abilities, such as memory and focus A painful and red tongue (glossitis) Mouth ulcers Pins and needles (paraesthesia) Disturbed vision Irritability Causes of Vitamin B12 deficiency

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Acknowledgements Editorial support was provided by Richard Ogilvy-Stewart of Apollo, OPEN Health Communications, and funded by Novo Nordisk A/S, in accordance with Good Publication Practice guidelines (www.ismpp.org/gpp-2022)

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An updated comprehensive review on vitamin A and carotenoids in breast cancer: mechanisms, genetics, assessment, current evidence, and future clinical implications

(National Academy Press) Zimmermann MB, Andersson M