do you inject b12 into fat or muscle What Happens If Fat? · SQ vs. IM · PA Relief Injection Site For B12 Shot
Description
It might cause a bit of discomfort, but its typically not painful

This medication is effective in fighting free radicals in the body and lowering the risk of damage caused by these free radicals

Methylcobalamin - Pubchem

Most side effects are mild and transient, such as temporary injection site discomfort or minor bruising that resolves within 2448 hours

Keep in mind when I got the ECG I was having a severe panic attack and had a heart rate of around 110 so not sure if this tachycardia caused by anxiety resulted in this assessment (I think it's an automated assessment from the machine)
:max_bytes(150000):strip_icc()/insulin-injection-478185779-594b3cae3df78cae8111498f.jpg)