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Special cases: In patients with neurological symptoms, the frequency may be initially more frequent and maintained at shorter intervals for a longer period of time

Avoid self-medication or overdose

For a broader look at what B12 does beyond energy including its role in nerves, methylation, and brain health see our complete vitamin B12 benefits guide

Additionally, the injection products may contain aluminum which may reach toxic concentrations with prolonged administration in patients with impaired renal function or in premature neonates with immature kidneys

Comparing Effectiveness Across Administration Routes Choosing the best way to get B12 depends on several things