is sublingual b12 as effective as injections Vitamin Shots for Energy & Wellness Vitamin B12 Tablets (Sublingual B12
Description
Unless the cause of B12 deficiency is temporary i.e

They bind to different receptors

For others, like chronic celiac or Crohns disease, you may need B12 injections throughout your life

Typically 18-24 months from the time of order.

Cancer immunology, immunotherapy: CII