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Animal studies showed thyroid C-cell tumors at exposures much higher than clinical doses

It balances comfort (thin enough to be relatively painless) with practicality (wide enough to draw medication without excessive time)

Tissue Repair & Regeneration : Enhances cellular proliferation, differentiation, and recovery processes across muscle, soft tissue, and other models

Also check your needle gauge , as thinner needles (29-30 gauge) reduce discomfort significantly

Oral supplementation has shown effectiveness but may not match the efficacy of IM in certain scenarios

However, some people cannot take vitamin B12 injections safely, including those with Lebers disease or similar eye concerns, kidney disease, liver disease, iron or folic acid deficiency, an active infection, or those taking medications that may interact with vitamin B12