how long does the vitamin b12 injection take to work Injections and Weight Loss: it Work? B12 Shots & B12 Injections:

Experiencing arm pain after a shot is common and usually not a cause for concern

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Vitamin B12 shots work right away and your body will begin to manufacture new red blood cells as early as 48 hours so you will feel the effect in two or three days

We will get you into a comfortable position with the injection site exposed

Allergic Reactions: Rare, but monitor for rash, urticaria, or anaphylaxis

Storage and Shelf Life Assurance Each ampoule is securely packaged to be stored in a cool, dry place, protected from light, maximizing its shelf life to 24-36 months from the date of manufacture