b12 injection size needle Choosing the Right and Syringe for Injections: A Complete Guide π Mastering Injection Techniques: Angles
Description
Evidence-based : Ensuring clinicians understand the difference between serum B12 levels and clinically active B12 stores, and other suitable tests to determine deficiency as well as symptom resolution with sufficiently frequent treatment
mild soreness for a day or two is normal

Storz et al

Fat storage pathways become more active
If you experience these symptoms, blood testing can confirm whether B12 deficiency is the cause