Taking B12 when your levels are already adequate wont boost hair growth
PubMed Sikiric, P., Seiwerth, S., Brcic, L., Sever, M., Klicek, R., Radic, B., Drmic, D., Ilic, S., & Kolenc, D
Some patients may benefit from more frequent injections initially, followed by maintenance shots
Methylcobalamin B12 is also indicated in those with pernicious anemia, diabetes, neuropathy, heart disease, circadian rhythm sleep disorders, memory loss, depression, fatigue, AIDS, inflammatory bowel disease (IBD), Lyme disease, osteoporosis, tendonitis, psychiatric disorders, Alzheimers disease, liver and kidney disease, and asthma
Use: Hair and scalp care