is injecting b12 a steroid Why Do You Need Injections? · PA Relief Best Vitamin B12 Injection Site:
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Depending on the individual, they start working within 48 to 72 hours of the first dose, but they might take three months to completely correct a B12 deficiency

The official prescribing information does mention depression under the Postmarketing Experience listing
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This process is much slower and less efficient than injection
