6 b12 injections Do You Need a Prescription for Injections? Compounded Hydroxocobalamin (Vitamin B12) Injection
Description
[1] This is to reduce the risk of hypotension or vein irritation

Safety and Tolerability of the Hexadecapeptide AOD9604 in Humans, Stier H., Vos E., Kenley D., Journal (Journal of Endocrinology and Metabolism, Volume 3, Issues 12, 2013, Pages 715)

With that in mind, here is what patients who are correcting a deficiency often report

Treatment frequency depends on your condition
the insulin mist is then absorbed over minutes, as shown in usage diagrams
