normal b12 injection dose Shots at Home: How, Where & How Often to Inject Yourself Vitamin B12 Injection Aftercare Card
Description
Second thing is you should be warming the oil I use a clean cup filled with warm water from the tap soak for 5 mins

preserves NAD+ salvage and SAM availability Regulatory status: not approved by the FDA or any other regulatory authority
Joint discomfort associated with B12 supplementation is uncommon and not listed amongst the recognised adverse effects in the Summary of Product Characteristics (SmPC) for licensed B12 preparations or in the British National Formulary (BNF)

Depending on the severity of the deficiency, synthetic forms of vitamin B can bring levels back to normal