Review medications: Some medications or multivitamins may contain B12 6
This is because though cobalamin will take a couple of weeks to reach appropriate levels in the body, especially if deficient, it can last in the body for a long time once it reaches appropriate concentrations
You may find vitamin injections beneficial depending on your needs and health status

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The idea is systemic rejuvenation: improving not just skin or hair, but overall cellular repair throughout the body
First dose felt some nausea and fatigue, but that was over within the first week