As everyone is different, it is impossible to say with 100% certainty how long a vitamin B12 injection lasts in the body
The most commonly reported side effects are mild and transient, including injection site reactions (redness, slight swelling, or tenderness), mild headaches during the initial days of use, and occasional dizziness or lightheadedness, particularly when starting the peptide
FDA Approval is considered the gold standard worldwide for efficacy and safety
You'll usually feel them as a fluttering or ripple just beneath the skin, most often in the eyelids, calves, feet, or arms, and they tend to be most noticeable when you're sitting or lying still
Your doctor can recommend the most appropriate formulation and dose for your circumstances