Oral B12 supplementation generally takes longer to produce noticeable effects than intramuscular injections, with patients typically experiencing improvements within 24 weeks
Technically yes its widely available as a research chemical. Wed strongly caution against it
"Serum N(1)-Methylnicotinamide Is Associated With Obesity and Diabetes in Chinese." Journal of Clinical Endocrinology & Metabolism
Injecting into muscle is more painful and may put you off selfinjecting, while injecting B12 into fat is painless and effective
This results in a sterile solution that is commonly used in various healthcare settings, such as hospitals, clinics, and home healthcare environments, for a variety of purposes, including medication preparation, wound care, and intravenous injection (IV) therapy
B12 injection can help vegans and vegetarians receive the nutrients their bodies need