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[13] Methionine and carnitine are present in breast milk in concentrations reflective of maternal plasma levels

Ye Shen, MS1

What that means isnt always straightforward: In the Swiss study mentioned above, nearly three-quarters of primary-care docs surveyed reported using a multi-step approach (and not always the same one) when testing for B12 deficiencya practice that Miller says improves the odds of an accurate diagnosis since serum B12 levels alone dont always accurately identify a deficiency

The NHS treatment pathway and the 2024 NICE guideline both assume B12 injections are given in a clinical setting against a confirmed deficiency, not self-sourced and self-administered

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as levels normalise, improved daytime energy may temporarily affect sleep-wake cycles Individual sensitivity : A small subset of people may be more sensitive to changes in B vitamin levels Formulation factors : Some B12 supplements contain additional ingredients that could affect sleepalways check product labels for stimulants like caffeine For the vast majority of people, vitamin B12 supplementation does not cause sleep disturbances when taken as directed