can b12 injections be given subcutaneously How to Give a Injection: Step-By-Step Instructions Choosing the Right Needle and

Patients should disclose all current medications, medical conditions, and relevant health history prior to treatment

Contact your GP if you experience: Unexpected symptoms after starting B12 supplementation, including persistent skin reactions, gastrointestinal disturbance, or mild allergic manifestations Neurological symptoms such as significant tingling, numbness, weakness, or balance problemsthese may indicate B12 deficiency paradoxically, or alternative neurological conditions requiring assessment Unexplained fatigue or malaise that develops or worsens despite supplementation Concerns about medication interactions , particularly if taking metformin, proton pump inhibitors, or other medications affecting B12 metabolism [2] [4] Seek emergency medical attention (call 999) if you develop signs of a severe allergic reaction following B12 injection, including facial swelling, difficulty breathing, or widespread urticaria

Drop back to the previous dose and attempt escalation again after an additional 2-4 weeks

If you have seen those two mixed up on forums, the source is unreliable

When will I feel the effects of a B12 shot

The most important factor is consistency of timing and route day to day, since the mechanism works cumulatively rather than as an acute event to time around a meal