People with low B12 may experience: Persistent fatigue or low energy Weakness Brain fog, concentration issues, or memory changes Low mood or irritability Pins and needles, numbness, or nerve-type sensations Mouth ulcers or a sore tongue Paleness or shortness of breath (if anaemia is present) Some symptoms can become more serious if deficiency is prolonged, particularly neurological symptoms
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Additionally, individuals on long-term proton pump inhibitors (PPIs) or metformin therapy are at increased risk due to drug-related malabsorption
Noticeable improvements within weeks
This applies to both compounds, but it is especially critical for tirzepatide where dose escalation directly impacts GI tolerability