b12 injections and vitiligo 5 Facts About Vitamins for Vitiligo: Can They Help? Compounded Cyanocobalamin (Vitamin B12) Injection

Usually, subcutaneous injection is adopted, and the dosage and treatment course need to be individualized

To boost levels its recommended one per week for four weeks then one a month

[PubMed abstract] Yazaki Y, Chow G, Mattie M

The usual "other issues" seem to be low folate, low ferritin, low vitamin D and thyroid problems -and so all these should be checked, treated if necessary and monitored

[1] It acts as a coenzyme in various enzymatic reactions and is often promoted for supporting healthy hair, skin, and nails, although scientific evidence for these cosmetic benefits in individuals without biotin deficiency remains limited