how long before b12 injection takes effect Injections: Who Should Get Them and Do They Last? Vitamin B12 Injections | When
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You need to consider the following factors when discussing dosage with your doctor

doi: 10.7759/cureus.34951

The corrin ring structure, which is the molecular backbone of vitamin B12, appears to alter the pharmacokinetic profile in a way that reduces central nervous system exposure to the emetogenic (nausea-causing) effects while preserving the metabolic benefits

Ill give it one more month, provide another update

