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One study in the The Journal of Allergy and Clinical Immunology found that some injected forms of B vitamins at higher doses, like B12, can be linked with an allergic reaction

I've taught a bunch of good nutrition-adjacent courses

Insulin Syringes (U-100) One syringe per weekly injection (pre-blended)

Individuals with certain health conditions, such as Lebers disease (a hereditary eye disease), should avoid B12 injections, as they can exacerbate symptoms

2018 Mar 13;5(1):6

[2] You may be looking to begin a B12 vitamin supplement to combat symptoms of a vitamin B12 deficiency or to fill nutritional gaps in your diet