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Your liver can store B12 for up to five years, but once those stores are depleted, symptoms can develop rapidly
Being off by even 0.2 mL changes your concentration enough to affect dosing accuracy over the life of the vial
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It is also important to be aware of symptoms that may suggest either worsening B12 deficiency or poorly controlled blood glucose, and to seek prompt medical advice if you experience: Persistent fatigue, breathlessness, or pallor (possible anaemia) Tingling, numbness, or weakness in the hands or feet (possible B12-related neuropathy) Unsteadiness when walking, or changes in memory or thinking (possible signs of more severe B12 deficiency requiring prompt assessment) Increased thirst, frequent urination, or unexplained weight loss (possible hyperglycaemia) If you think you may be experiencing a side effect from a medicine for example, symptoms of B12 deficiency that you believe may be related to metformin you or your healthcare professional can report this via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk
Vitamin B12 shots work by delivering cobalamin directly into your system, allowing your body to use it immediately for energy, nerve health, and blood cell production