I've brought this up before on this forum and got all the same kind of advice you got, and I do everything properly, and I've been doing it once or twice a week for years, so for me it's just become a fact of life that it's going to hurt
Kuzminski, 1998
Carrasco-Gallardo C, Guzmn L, Maccioni RB
Forms of Injectable Vitamin B12 Before you learn how to give a vitamin B12 shot , its important to understand the types of B12 used: Cyanocobalamin : A synthetic form of B12, widely available, cost-effective, and stable
Sikirics team looked for this protective substance directly in gastric juice, and they found it
Specificity of staining was confirmed by staining with a rat IgG (6-001-F, R&D Systems, Bio-Techne), a Rabbit IgG (ab27478, Abcam) or a mouse IgG1, kappa (Abcam, ab18443) isotype controls