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

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

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

B12 can also be taken as a sublingual tablet, and this is a suitable choice for anyone that doesn't want to get an injection and purchase vitamin B12 without a prescription

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