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Unlike caffeine, which provides a temporary jolt of energy followed by a crash, B12 injections offer a more sustainable and long-lasting increase in energy
When they happen, they usually occur only after the initial doses and fade as your body adjusts
Doctors may also consider whether there are overlapping causes such as iron deficiency or chronic illness
If your hair loss has other primary causes (such as androgenetic alopecia), correcting B12 deficiency alone may not resolve the issue though it will support overall hair health as part of a comprehensive approach
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