b12 injections causing fatigue I Feel Tired All the Time. Do I Need a Shot?: Shawn Veiseh, M.D.: Family Medicine Only One Chance - B12
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Weill Cornell Medicine

But many users speak about a broader shift in flavour perception-duller sweetness, bitterness, numbness in the tongue, or strange taste distortions that affect everything from coffee to favourite meals
How do I know if I need a B12 supplement

Serum B12 levels may therefore serve as a marker of hepatic injury, with higher levels sometimes correlating with disease severity
It has broader clinical applications, such as in dermatology, scalp health, and tissue regeneration