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A deficiency may cause hair loss, but extra B12 only helps if levels are low

In combination with other vitamins, it helps in strengthening the immune system, improves metabolism of the body, and is important for the nervous system

Acknowledgements Editorial Staff Elizabeth Jean Betsch, ELS Amy Zierler, BA Medical Information Services Corinne Holubowich, BEd, MLIS Kellee Kaulback, BA(H), MISt Clinical Expert Advisory Panel: Appropriate Utilization of Vitamin B12 Testing for Neurocognitive-Based Indications

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When B12 levels become problematic: High-dose supplementation (particularly doses exceeding 1,000 micrograms daily) Frequent B12 injections without medical supervision Underlying conditions affecting B12 metabolism Concurrent use of multiple B12-containing supplements The NHS does not set an upper safe limit for vitamin B12 because harmful effects from excessive intake have not been definitively established

The Science Behind B12 Injections Understanding how B12 works in your body explains why injectable forms can be so effective for many people