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However, most labs in the UK use the following reference values: The vitamin B12 normal range for female and vitamin B12 normal range for male adults is generally the same, though individual levels may vary slightly due to dietary habits, hormonal differences, or metabolic factors
The MHRA, in April 2026, has effectively made the same call
Unlike standard sterile water, bacteriostatic water is formulated to slow the growth of bacteria inside the vial
Vial size does not determine dose by itself
However, MMA levels can be elevated in those with thyroid and kidney conditions, which limits the tests specificity (9, 10)
Standard Cap, No Seal Verification Standard screw caps with no tamper-evident seal integrity cannot be confirmed on arrival
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