Third-party HPLC purity and a batch COA: We looked for a recent certificate tied to the exact lot, not a generic purity claim above 99%
Importantly, if you have unexpectedly high B12 levels without taking supplements or receiving injections, this warrants GP review as it may indicate underlying liver disease, kidney disease, or certain blood disorders
For those with a genuine, diagnosed B12 deficiency causing their fatigue, improvements can sometimes be noticed within a few days to a week
The Fix: Write down your formula
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Lloyd-Turner, S., Peters, J., & Harrison, L