protocol for b12 injections and Folate Testing – GP Gateway B12 Shots at Home: How,

Now as for plain lipo I cant answer for that

If a patient without a diagnosed vitamin B12 deficiency is receiving the vitamin through regular injections to experience the multitude of benefits, the frequency of these injections can vary quite a bit depending on the reason they are getting the injections (weight loss treatments will likely have a higher frequency of vitamin injections than other treatments) and this timeline will be established by the patient and the specialist providing the injections to ensure that the treatment is both as safe and as effective as possible

For hair, apart from cases of deficiency (or certain rare hair disorders in children that responded to biotin), research does not show a significant benefit of extra biotin in otherwise healthy people

So if youre short on the nutrient, the shots may help normalize your mood