Elevated serum B12 levels (hypercobalaminaemia) often serve as a biomarker for serious underlying conditions rather than being directly harmful themselves
Vegetarian sources of B12 include chlorella, nori, nutritional yeast and certain mushrooms, but many vegans and vegetarians have insufficient levels of B12 because its not widely found in plants. According to Mullane, not getting enough B12 can result in issues like anaemia, fatigue and more intense symptoms including shortness of breath, palpitations, pale skin, muscle weakness, numbness and tingling in hands or feet, blurred vision and memory loss
Here are the main consequences: Liver problems: It can overload the liver, the organ responsible for storing vitamin B12
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Feb 11, 2026 You are staring at a vial of lyophilized tirzepatide powder, a syringe in one hand and a bottle of bacteriostatic water in the other, and absolutely nothing about this process feels intuitive