how fast does b12 injection work Quickly a Shot Work? What to Expect The Truth About B12 Injections:
Description
All experiments were carried out in accordance with the Guide for the Care and Use of Laboratory Animals [20] and with approval from the Institutional Animal Care and Use Committee at the University of Texas Medical Branch

Membership provides the customization

Benefits of vitamin B12 injections for your skin 1

I can't think of any way in which this would happen

The dose might change based on how severe the deficiency is
