can you inject b12 more than once a day Vitamin Monthly Injection: Typical Dose & Schedule What Is the Effective Dose
Description
Additionally, health conditions like anemia can be addressed with vitamin B12 injections

Are the results permanent
Changes to the skin The quality of the undereye skin can contribute to dark circles
doi: 10.1038/s41387-022-00181-8

It works in conjunction with folate to help develop new cells and to support the function of existing cells (via a process called methylation)
