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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

Some protocols call for a one-month break every two months of use

The treatment itself takes just 5 to 10 minutes

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

No, its not necessary

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