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location for injection of b12 Best Vitamin Sites: Where to Inject B12 · PA Relief B12 Injection Dosage and Frequency:
Description
AFTER MONTH 1, THE DOSAGE PER INJECTION INCREASES GRADUALLY IN MONTH 2, 3, AND 4

Approximately 5090% of the body's total B12 stores reside in the liver, making hepatic function important for maintaining adequate B12 status over time

And this deficiency could cause memory or thinking and nerve damage

Blood (2015) 2203:abstract 2203

That's called methyl trapping
