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NICE Clinical Knowledge Summaries and British Society for Haematology guidelines support B12 supplementation in these clinical contexts, with treatment regimens tailored to the underlying cause
The endocrine system produces molecules that are used to carry messages to various parts of the body
Prescribed and monitored by our medical team
Retrieved 24 November 2025
For people with normal B12, any weight change is usually small, inconsistent, and behaviorally driven (more activity, better appetite) rather than a direct effect of the vitamin
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